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85b4aa49 | 1 | /* |
af7f85d9 | 2 | * Copyright(c) 2007 - 2009 Intel Corporation. All rights reserved. |
85b4aa49 RL |
3 | * |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., | |
15 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
16 | * | |
17 | * Maintained at www.Open-FCoE.org | |
18 | */ | |
19 | ||
20 | #include <linux/module.h> | |
21 | #include <linux/version.h> | |
85b4aa49 | 22 | #include <linux/spinlock.h> |
85b4aa49 RL |
23 | #include <linux/netdevice.h> |
24 | #include <linux/etherdevice.h> | |
25 | #include <linux/ethtool.h> | |
26 | #include <linux/if_ether.h> | |
27 | #include <linux/if_vlan.h> | |
85b4aa49 RL |
28 | #include <linux/crc32.h> |
29 | #include <linux/cpu.h> | |
30 | #include <linux/fs.h> | |
31 | #include <linux/sysfs.h> | |
32 | #include <linux/ctype.h> | |
33 | #include <scsi/scsi_tcq.h> | |
34 | #include <scsi/scsicam.h> | |
35 | #include <scsi/scsi_transport.h> | |
36 | #include <scsi/scsi_transport_fc.h> | |
37 | #include <net/rtnetlink.h> | |
38 | ||
39 | #include <scsi/fc/fc_encaps.h> | |
97c8389d | 40 | #include <scsi/fc/fc_fip.h> |
85b4aa49 RL |
41 | |
42 | #include <scsi/libfc.h> | |
43 | #include <scsi/fc_frame.h> | |
44 | #include <scsi/libfcoe.h> | |
85b4aa49 | 45 | |
fdd78027 | 46 | #include "fcoe.h" |
7f349142 | 47 | |
85b4aa49 RL |
48 | MODULE_AUTHOR("Open-FCoE.org"); |
49 | MODULE_DESCRIPTION("FCoE"); | |
9b34ecff | 50 | MODULE_LICENSE("GPL v2"); |
85b4aa49 | 51 | |
05cc7390 YZ |
52 | /* Performance tuning parameters for fcoe */ |
53 | static unsigned int fcoe_ddp_min; | |
54 | module_param_named(ddp_min, fcoe_ddp_min, uint, S_IRUGO | S_IWUSR); | |
55 | MODULE_PARM_DESC(ddp_min, "Minimum I/O size in bytes for " \ | |
56 | "Direct Data Placement (DDP)."); | |
57 | ||
dfc1d0fe CL |
58 | DEFINE_MUTEX(fcoe_config_mutex); |
59 | ||
e7a51997 JE |
60 | /* fcoe_percpu_clean completion. Waiter protected by fcoe_create_mutex */ |
61 | static DECLARE_COMPLETION(fcoe_flush_completion); | |
62 | ||
85b4aa49 | 63 | /* fcoe host list */ |
090eb6c4 | 64 | /* must only by accessed under the RTNL mutex */ |
85b4aa49 | 65 | LIST_HEAD(fcoe_hostlist); |
5e5e92df | 66 | DEFINE_PER_CPU(struct fcoe_percpu_s, fcoe_percpu); |
85b4aa49 | 67 | |
dd3fd72e | 68 | /* Function Prototypes */ |
fdd78027 VD |
69 | static int fcoe_reset(struct Scsi_Host *shost); |
70 | static int fcoe_xmit(struct fc_lport *, struct fc_frame *); | |
71 | static int fcoe_rcv(struct sk_buff *, struct net_device *, | |
72 | struct packet_type *, struct net_device *); | |
73 | static int fcoe_percpu_receive_thread(void *arg); | |
74 | static void fcoe_clean_pending_queue(struct fc_lport *lp); | |
75 | static void fcoe_percpu_clean(struct fc_lport *lp); | |
76 | static int fcoe_link_ok(struct fc_lport *lp); | |
77 | ||
78 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *); | |
79 | static int fcoe_hostlist_add(const struct fc_lport *); | |
fdd78027 | 80 | |
4bb6b515 | 81 | static void fcoe_check_wait_queue(struct fc_lport *, struct sk_buff *); |
85b4aa49 RL |
82 | static int fcoe_device_notification(struct notifier_block *, ulong, void *); |
83 | static void fcoe_dev_setup(void); | |
84 | static void fcoe_dev_cleanup(void); | |
2e70e241 CL |
85 | static struct fcoe_interface * |
86 | fcoe_hostlist_lookup_port(const struct net_device *dev); | |
85b4aa49 RL |
87 | |
88 | /* notification function from net device */ | |
89 | static struct notifier_block fcoe_notifier = { | |
90 | .notifier_call = fcoe_device_notification, | |
91 | }; | |
92 | ||
7f349142 VD |
93 | static struct scsi_transport_template *scsi_transport_fcoe_sw; |
94 | ||
95 | struct fc_function_template fcoe_transport_function = { | |
96 | .show_host_node_name = 1, | |
97 | .show_host_port_name = 1, | |
98 | .show_host_supported_classes = 1, | |
99 | .show_host_supported_fc4s = 1, | |
100 | .show_host_active_fc4s = 1, | |
101 | .show_host_maxframe_size = 1, | |
102 | ||
103 | .show_host_port_id = 1, | |
104 | .show_host_supported_speeds = 1, | |
105 | .get_host_speed = fc_get_host_speed, | |
106 | .show_host_speed = 1, | |
107 | .show_host_port_type = 1, | |
108 | .get_host_port_state = fc_get_host_port_state, | |
109 | .show_host_port_state = 1, | |
110 | .show_host_symbolic_name = 1, | |
111 | ||
112 | .dd_fcrport_size = sizeof(struct fc_rport_libfc_priv), | |
113 | .show_rport_maxframe_size = 1, | |
114 | .show_rport_supported_classes = 1, | |
115 | ||
116 | .show_host_fabric_name = 1, | |
117 | .show_starget_node_name = 1, | |
118 | .show_starget_port_name = 1, | |
119 | .show_starget_port_id = 1, | |
120 | .set_rport_dev_loss_tmo = fc_set_rport_loss_tmo, | |
121 | .show_rport_dev_loss_tmo = 1, | |
122 | .get_fc_host_stats = fc_get_host_stats, | |
123 | .issue_fc_host_lip = fcoe_reset, | |
124 | ||
125 | .terminate_rport_io = fc_rport_terminate_io, | |
126 | }; | |
127 | ||
128 | static struct scsi_host_template fcoe_shost_template = { | |
129 | .module = THIS_MODULE, | |
130 | .name = "FCoE Driver", | |
131 | .proc_name = FCOE_NAME, | |
132 | .queuecommand = fc_queuecommand, | |
133 | .eh_abort_handler = fc_eh_abort, | |
134 | .eh_device_reset_handler = fc_eh_device_reset, | |
135 | .eh_host_reset_handler = fc_eh_host_reset, | |
136 | .slave_alloc = fc_slave_alloc, | |
137 | .change_queue_depth = fc_change_queue_depth, | |
138 | .change_queue_type = fc_change_queue_type, | |
139 | .this_id = -1, | |
14caf44c | 140 | .cmd_per_lun = 3, |
7f349142 VD |
141 | .can_queue = FCOE_MAX_OUTSTANDING_COMMANDS, |
142 | .use_clustering = ENABLE_CLUSTERING, | |
143 | .sg_tablesize = SG_ALL, | |
144 | .max_sectors = 0xffff, | |
145 | }; | |
146 | ||
54b649f8 CL |
147 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, |
148 | struct packet_type *ptype, | |
149 | struct net_device *orig_dev); | |
150 | /** | |
151 | * fcoe_interface_setup() | |
152 | * @fcoe: new fcoe_interface | |
153 | * @netdev : ptr to the associated netdevice struct | |
154 | * | |
155 | * Returns : 0 for success | |
2e70e241 | 156 | * Locking: must be called with the RTNL mutex held |
54b649f8 CL |
157 | */ |
158 | static int fcoe_interface_setup(struct fcoe_interface *fcoe, | |
159 | struct net_device *netdev) | |
160 | { | |
161 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
162 | struct netdev_hw_addr *ha; | |
163 | u8 flogi_maddr[ETH_ALEN]; | |
b7a727f1 | 164 | const struct net_device_ops *ops; |
54b649f8 CL |
165 | |
166 | fcoe->netdev = netdev; | |
167 | ||
b7a727f1 YZ |
168 | /* Let LLD initialize for FCoE */ |
169 | ops = netdev->netdev_ops; | |
170 | if (ops->ndo_fcoe_enable) { | |
171 | if (ops->ndo_fcoe_enable(netdev)) | |
172 | FCOE_NETDEV_DBG(netdev, "Failed to enable FCoE" | |
173 | " specific feature for LLD.\n"); | |
174 | } | |
175 | ||
54b649f8 CL |
176 | /* Do not support for bonding device */ |
177 | if ((netdev->priv_flags & IFF_MASTER_ALB) || | |
178 | (netdev->priv_flags & IFF_SLAVE_INACTIVE) || | |
179 | (netdev->priv_flags & IFF_MASTER_8023AD)) { | |
180 | return -EOPNOTSUPP; | |
181 | } | |
182 | ||
183 | /* look for SAN MAC address, if multiple SAN MACs exist, only | |
184 | * use the first one for SPMA */ | |
185 | rcu_read_lock(); | |
186 | for_each_dev_addr(netdev, ha) { | |
187 | if ((ha->type == NETDEV_HW_ADDR_T_SAN) && | |
188 | (is_valid_ether_addr(fip->ctl_src_addr))) { | |
189 | memcpy(fip->ctl_src_addr, ha->addr, ETH_ALEN); | |
190 | fip->spma = 1; | |
191 | break; | |
192 | } | |
193 | } | |
194 | rcu_read_unlock(); | |
195 | ||
196 | /* setup Source Mac Address */ | |
197 | if (!fip->spma) | |
198 | memcpy(fip->ctl_src_addr, netdev->dev_addr, netdev->addr_len); | |
199 | ||
200 | /* | |
201 | * Add FCoE MAC address as second unicast MAC address | |
202 | * or enter promiscuous mode if not capable of listening | |
203 | * for multiple unicast MACs. | |
204 | */ | |
54b649f8 CL |
205 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
206 | dev_unicast_add(netdev, flogi_maddr); | |
207 | if (fip->spma) | |
208 | dev_unicast_add(netdev, fip->ctl_src_addr); | |
209 | dev_mc_add(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
54b649f8 CL |
210 | |
211 | /* | |
212 | * setup the receive function from ethernet driver | |
213 | * on the ethertype for the given device | |
214 | */ | |
215 | fcoe->fcoe_packet_type.func = fcoe_rcv; | |
216 | fcoe->fcoe_packet_type.type = __constant_htons(ETH_P_FCOE); | |
217 | fcoe->fcoe_packet_type.dev = netdev; | |
218 | dev_add_pack(&fcoe->fcoe_packet_type); | |
219 | ||
220 | fcoe->fip_packet_type.func = fcoe_fip_recv; | |
221 | fcoe->fip_packet_type.type = htons(ETH_P_FIP); | |
222 | fcoe->fip_packet_type.dev = netdev; | |
223 | dev_add_pack(&fcoe->fip_packet_type); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb); | |
11b56188 CL |
229 | static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr); |
230 | static u8 *fcoe_get_src_mac(struct fc_lport *lport); | |
2e70e241 | 231 | static void fcoe_destroy_work(struct work_struct *work); |
54b649f8 | 232 | |
030f4e00 CL |
233 | /** |
234 | * fcoe_interface_create() | |
235 | * @netdev: network interface | |
236 | * | |
237 | * Returns: pointer to a struct fcoe_interface or NULL on error | |
238 | */ | |
239 | static struct fcoe_interface *fcoe_interface_create(struct net_device *netdev) | |
240 | { | |
241 | struct fcoe_interface *fcoe; | |
242 | ||
243 | fcoe = kzalloc(sizeof(*fcoe), GFP_KERNEL); | |
244 | if (!fcoe) { | |
245 | FCOE_NETDEV_DBG(netdev, "Could not allocate fcoe structure\n"); | |
246 | return NULL; | |
247 | } | |
248 | ||
2e70e241 | 249 | dev_hold(netdev); |
030f4e00 | 250 | kref_init(&fcoe->kref); |
54b649f8 CL |
251 | |
252 | /* | |
253 | * Initialize FIP. | |
254 | */ | |
255 | fcoe_ctlr_init(&fcoe->ctlr); | |
256 | fcoe->ctlr.send = fcoe_fip_send; | |
257 | fcoe->ctlr.update_mac = fcoe_update_src_mac; | |
11b56188 | 258 | fcoe->ctlr.get_src_addr = fcoe_get_src_mac; |
54b649f8 CL |
259 | |
260 | fcoe_interface_setup(fcoe, netdev); | |
030f4e00 CL |
261 | |
262 | return fcoe; | |
263 | } | |
264 | ||
54b649f8 CL |
265 | /** |
266 | * fcoe_interface_cleanup() - clean up netdev configurations | |
267 | * @fcoe: | |
2e70e241 CL |
268 | * |
269 | * Caller must be holding the RTNL mutex | |
54b649f8 CL |
270 | */ |
271 | void fcoe_interface_cleanup(struct fcoe_interface *fcoe) | |
272 | { | |
273 | struct net_device *netdev = fcoe->netdev; | |
274 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
275 | u8 flogi_maddr[ETH_ALEN]; | |
b7a727f1 | 276 | const struct net_device_ops *ops; |
54b649f8 CL |
277 | |
278 | /* | |
279 | * Don't listen for Ethernet packets anymore. | |
280 | * synchronize_net() ensures that the packet handlers are not running | |
281 | * on another CPU. dev_remove_pack() would do that, this calls the | |
282 | * unsyncronized version __dev_remove_pack() to avoid multiple delays. | |
283 | */ | |
284 | __dev_remove_pack(&fcoe->fcoe_packet_type); | |
285 | __dev_remove_pack(&fcoe->fip_packet_type); | |
286 | synchronize_net(); | |
287 | ||
54b649f8 | 288 | /* Delete secondary MAC addresses */ |
54b649f8 CL |
289 | memcpy(flogi_maddr, (u8[6]) FC_FCOE_FLOGI_MAC, ETH_ALEN); |
290 | dev_unicast_delete(netdev, flogi_maddr); | |
54b649f8 CL |
291 | if (fip->spma) |
292 | dev_unicast_delete(netdev, fip->ctl_src_addr); | |
293 | dev_mc_delete(netdev, FIP_ALL_ENODE_MACS, ETH_ALEN, 0); | |
b7a727f1 YZ |
294 | |
295 | /* Tell the LLD we are done w/ FCoE */ | |
296 | ops = netdev->netdev_ops; | |
297 | if (ops->ndo_fcoe_disable) { | |
298 | if (ops->ndo_fcoe_disable(netdev)) | |
299 | FCOE_NETDEV_DBG(netdev, "Failed to disable FCoE" | |
300 | " specific feature for LLD.\n"); | |
301 | } | |
54b649f8 CL |
302 | } |
303 | ||
030f4e00 CL |
304 | /** |
305 | * fcoe_interface_release() - fcoe_port kref release function | |
306 | * @kref: embedded reference count in an fcoe_interface struct | |
307 | */ | |
308 | static void fcoe_interface_release(struct kref *kref) | |
309 | { | |
310 | struct fcoe_interface *fcoe; | |
2e70e241 | 311 | struct net_device *netdev; |
030f4e00 CL |
312 | |
313 | fcoe = container_of(kref, struct fcoe_interface, kref); | |
2e70e241 CL |
314 | netdev = fcoe->netdev; |
315 | /* tear-down the FCoE controller */ | |
316 | fcoe_ctlr_destroy(&fcoe->ctlr); | |
030f4e00 | 317 | kfree(fcoe); |
2e70e241 | 318 | dev_put(netdev); |
030f4e00 CL |
319 | } |
320 | ||
321 | /** | |
322 | * fcoe_interface_get() | |
323 | * @fcoe: | |
324 | */ | |
325 | static inline void fcoe_interface_get(struct fcoe_interface *fcoe) | |
326 | { | |
327 | kref_get(&fcoe->kref); | |
328 | } | |
329 | ||
330 | /** | |
331 | * fcoe_interface_put() | |
332 | * @fcoe: | |
333 | */ | |
334 | static inline void fcoe_interface_put(struct fcoe_interface *fcoe) | |
335 | { | |
336 | kref_put(&fcoe->kref, fcoe_interface_release); | |
337 | } | |
338 | ||
ab6b85c1 VD |
339 | /** |
340 | * fcoe_fip_recv - handle a received FIP frame. | |
341 | * @skb: the receive skb | |
342 | * @dev: associated &net_device | |
343 | * @ptype: the &packet_type structure which was used to register this handler. | |
344 | * @orig_dev: original receive &net_device, in case @dev is a bond. | |
345 | * | |
346 | * Returns: 0 for success | |
347 | */ | |
348 | static int fcoe_fip_recv(struct sk_buff *skb, struct net_device *dev, | |
349 | struct packet_type *ptype, | |
350 | struct net_device *orig_dev) | |
351 | { | |
259ad85d | 352 | struct fcoe_interface *fcoe; |
ab6b85c1 | 353 | |
259ad85d | 354 | fcoe = container_of(ptype, struct fcoe_interface, fip_packet_type); |
3fe9a0ba | 355 | fcoe_ctlr_recv(&fcoe->ctlr, skb); |
ab6b85c1 VD |
356 | return 0; |
357 | } | |
358 | ||
359 | /** | |
360 | * fcoe_fip_send() - send an Ethernet-encapsulated FIP frame. | |
361 | * @fip: FCoE controller. | |
362 | * @skb: FIP Packet. | |
363 | */ | |
364 | static void fcoe_fip_send(struct fcoe_ctlr *fip, struct sk_buff *skb) | |
365 | { | |
3fe9a0ba | 366 | skb->dev = fcoe_from_ctlr(fip)->netdev; |
ab6b85c1 VD |
367 | dev_queue_xmit(skb); |
368 | } | |
369 | ||
370 | /** | |
371 | * fcoe_update_src_mac() - Update Ethernet MAC filters. | |
11b56188 CL |
372 | * @lport: libfc lport |
373 | * @addr: Unicast MAC address to add. | |
ab6b85c1 VD |
374 | * |
375 | * Remove any previously-set unicast MAC filter. | |
376 | * Add secondary FCoE MAC address filter for our OUI. | |
377 | */ | |
11b56188 | 378 | static void fcoe_update_src_mac(struct fc_lport *lport, u8 *addr) |
ab6b85c1 | 379 | { |
11b56188 CL |
380 | struct fcoe_port *port = lport_priv(lport); |
381 | struct fcoe_interface *fcoe = port->fcoe; | |
25024989 | 382 | |
ab6b85c1 | 383 | rtnl_lock(); |
11b56188 CL |
384 | if (!is_zero_ether_addr(port->data_src_addr)) |
385 | dev_unicast_delete(fcoe->netdev, port->data_src_addr); | |
386 | if (!is_zero_ether_addr(addr)) | |
387 | dev_unicast_add(fcoe->netdev, addr); | |
388 | memcpy(port->data_src_addr, addr, ETH_ALEN); | |
ab6b85c1 VD |
389 | rtnl_unlock(); |
390 | } | |
391 | ||
11b56188 CL |
392 | /** |
393 | * fcoe_get_src_mac() - return the Ethernet source address for an lport | |
394 | * @lport: libfc lport | |
395 | */ | |
396 | static u8 *fcoe_get_src_mac(struct fc_lport *lport) | |
397 | { | |
398 | struct fcoe_port *port = lport_priv(lport); | |
399 | ||
400 | return port->data_src_addr; | |
401 | } | |
402 | ||
7f349142 VD |
403 | /** |
404 | * fcoe_lport_config() - sets up the fc_lport | |
405 | * @lp: ptr to the fc_lport | |
7f349142 VD |
406 | * |
407 | * Returns: 0 for success | |
408 | */ | |
409 | static int fcoe_lport_config(struct fc_lport *lp) | |
410 | { | |
411 | lp->link_up = 0; | |
412 | lp->qfull = 0; | |
413 | lp->max_retry_count = 3; | |
a3666955 | 414 | lp->max_rport_retry_count = 3; |
7f349142 VD |
415 | lp->e_d_tov = 2 * 1000; /* FC-FS default */ |
416 | lp->r_a_tov = 2 * 2 * 1000; | |
417 | lp->service_params = (FCP_SPPF_INIT_FCN | FCP_SPPF_RD_XRDY_DIS | | |
418 | FCP_SPPF_RETRY | FCP_SPPF_CONF_COMPL); | |
419 | ||
420 | fc_lport_init_stats(lp); | |
421 | ||
422 | /* lport fc_lport related configuration */ | |
423 | fc_lport_config(lp); | |
424 | ||
425 | /* offload related configuration */ | |
426 | lp->crc_offload = 0; | |
427 | lp->seq_offload = 0; | |
428 | lp->lro_enabled = 0; | |
429 | lp->lro_xid = 0; | |
430 | lp->lso_max = 0; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
1047f221 VD |
435 | /** |
436 | * fcoe_queue_timer() - fcoe queue timer | |
437 | * @lp: the fc_lport pointer | |
438 | * | |
439 | * Calls fcoe_check_wait_queue on timeout | |
440 | * | |
441 | */ | |
442 | static void fcoe_queue_timer(ulong lp) | |
443 | { | |
444 | fcoe_check_wait_queue((struct fc_lport *)lp, NULL); | |
445 | } | |
446 | ||
7f349142 VD |
447 | /** |
448 | * fcoe_netdev_config() - Set up netdev for SW FCoE | |
449 | * @lp : ptr to the fc_lport | |
450 | * @netdev : ptr to the associated netdevice struct | |
451 | * | |
452 | * Must be called after fcoe_lport_config() as it will use lport mutex | |
453 | * | |
454 | * Returns : 0 for success | |
455 | */ | |
456 | static int fcoe_netdev_config(struct fc_lport *lp, struct net_device *netdev) | |
457 | { | |
458 | u32 mfs; | |
459 | u64 wwnn, wwpn; | |
25024989 | 460 | struct fcoe_interface *fcoe; |
014f5c3f | 461 | struct fcoe_port *port; |
7f349142 VD |
462 | |
463 | /* Setup lport private data to point to fcoe softc */ | |
014f5c3f | 464 | port = lport_priv(lp); |
25024989 | 465 | fcoe = port->fcoe; |
7f349142 VD |
466 | |
467 | /* | |
468 | * Determine max frame size based on underlying device and optional | |
469 | * user-configured limit. If the MFS is too low, fcoe_link_ok() | |
470 | * will return 0, so do this first. | |
471 | */ | |
7221d7e5 YZ |
472 | mfs = netdev->mtu; |
473 | if (netdev->features & NETIF_F_FCOE_MTU) { | |
474 | mfs = FCOE_MTU; | |
475 | FCOE_NETDEV_DBG(netdev, "Supports FCOE_MTU of %d bytes\n", mfs); | |
476 | } | |
477 | mfs -= (sizeof(struct fcoe_hdr) + sizeof(struct fcoe_crc_eof)); | |
7f349142 VD |
478 | if (fc_set_mfs(lp, mfs)) |
479 | return -EINVAL; | |
480 | ||
7f349142 | 481 | /* offload features support */ |
1d1b88dc | 482 | if (netdev->features & NETIF_F_SG) |
7f349142 VD |
483 | lp->sg_supp = 1; |
484 | ||
7f349142 VD |
485 | if (netdev->features & NETIF_F_FCOE_CRC) { |
486 | lp->crc_offload = 1; | |
d5488eb9 | 487 | FCOE_NETDEV_DBG(netdev, "Supports FCCRC offload\n"); |
7f349142 | 488 | } |
7f349142 VD |
489 | if (netdev->features & NETIF_F_FSO) { |
490 | lp->seq_offload = 1; | |
491 | lp->lso_max = netdev->gso_max_size; | |
d5488eb9 RL |
492 | FCOE_NETDEV_DBG(netdev, "Supports LSO for max len 0x%x\n", |
493 | lp->lso_max); | |
7f349142 | 494 | } |
7f349142 VD |
495 | if (netdev->fcoe_ddp_xid) { |
496 | lp->lro_enabled = 1; | |
497 | lp->lro_xid = netdev->fcoe_ddp_xid; | |
d5488eb9 RL |
498 | FCOE_NETDEV_DBG(netdev, "Supports LRO for max xid 0x%x\n", |
499 | lp->lro_xid); | |
7f349142 | 500 | } |
014f5c3f CL |
501 | skb_queue_head_init(&port->fcoe_pending_queue); |
502 | port->fcoe_pending_queue_active = 0; | |
503 | setup_timer(&port->timer, fcoe_queue_timer, (unsigned long)lp); | |
7f349142 | 504 | |
1d1b88dc | 505 | wwnn = fcoe_wwn_from_mac(netdev->dev_addr, 1, 0); |
7f349142 VD |
506 | fc_set_wwnn(lp, wwnn); |
507 | /* XXX - 3rd arg needs to be vlan id */ | |
1d1b88dc | 508 | wwpn = fcoe_wwn_from_mac(netdev->dev_addr, 2, 0); |
7f349142 VD |
509 | fc_set_wwpn(lp, wwpn); |
510 | ||
7f349142 VD |
511 | return 0; |
512 | } | |
513 | ||
514 | /** | |
515 | * fcoe_shost_config() - Sets up fc_lport->host | |
516 | * @lp : ptr to the fc_lport | |
517 | * @shost : ptr to the associated scsi host | |
518 | * @dev : device associated to scsi host | |
519 | * | |
520 | * Must be called after fcoe_lport_config() and fcoe_netdev_config() | |
521 | * | |
522 | * Returns : 0 for success | |
523 | */ | |
524 | static int fcoe_shost_config(struct fc_lport *lp, struct Scsi_Host *shost, | |
525 | struct device *dev) | |
526 | { | |
527 | int rc = 0; | |
528 | ||
529 | /* lport scsi host config */ | |
7f349142 VD |
530 | lp->host->max_lun = FCOE_MAX_LUN; |
531 | lp->host->max_id = FCOE_MAX_FCP_TARGET; | |
532 | lp->host->max_channel = 0; | |
533 | lp->host->transportt = scsi_transport_fcoe_sw; | |
534 | ||
535 | /* add the new host to the SCSI-ml */ | |
536 | rc = scsi_add_host(lp->host, dev); | |
537 | if (rc) { | |
d5488eb9 RL |
538 | FCOE_NETDEV_DBG(fcoe_netdev(lp), "fcoe_shost_config: " |
539 | "error on scsi_add_host\n"); | |
7f349142 VD |
540 | return rc; |
541 | } | |
542 | sprintf(fc_host_symbolic_name(lp->host), "%s v%s over %s", | |
543 | FCOE_NAME, FCOE_VERSION, | |
544 | fcoe_netdev(lp)->name); | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
d7179680 VD |
549 | /* |
550 | * fcoe_oem_match() - match for read types IO | |
551 | * @fp: the fc_frame for new IO. | |
552 | * | |
553 | * Returns : true for read types IO, otherwise returns false. | |
554 | */ | |
555 | bool fcoe_oem_match(struct fc_frame *fp) | |
556 | { | |
05cc7390 YZ |
557 | return fc_fcp_is_read(fr_fsp(fp)) && |
558 | (fr_fsp(fp)->data_len > fcoe_ddp_min); | |
d7179680 VD |
559 | } |
560 | ||
7f349142 VD |
561 | /** |
562 | * fcoe_em_config() - allocates em for this lport | |
014f5c3f | 563 | * @lp: the fcoe that em is to allocated for |
7f349142 VD |
564 | * |
565 | * Returns : 0 on success | |
566 | */ | |
567 | static inline int fcoe_em_config(struct fc_lport *lp) | |
568 | { | |
014f5c3f | 569 | struct fcoe_port *port = lport_priv(lp); |
25024989 CL |
570 | struct fcoe_interface *fcoe = port->fcoe; |
571 | struct fcoe_interface *oldfcoe = NULL; | |
1d1b88dc | 572 | struct net_device *old_real_dev, *cur_real_dev; |
d7179680 VD |
573 | u16 min_xid = FCOE_MIN_XID; |
574 | u16 max_xid = FCOE_MAX_XID; | |
575 | ||
576 | /* | |
577 | * Check if need to allocate an em instance for | |
578 | * offload exchange ids to be shared across all VN_PORTs/lport. | |
579 | */ | |
580 | if (!lp->lro_enabled || !lp->lro_xid || (lp->lro_xid >= max_xid)) { | |
581 | lp->lro_xid = 0; | |
582 | goto skip_oem; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Reuse existing offload em instance in case | |
1d1b88dc | 587 | * it is already allocated on real eth device |
d7179680 | 588 | */ |
25024989 CL |
589 | if (fcoe->netdev->priv_flags & IFF_802_1Q_VLAN) |
590 | cur_real_dev = vlan_dev_real_dev(fcoe->netdev); | |
1d1b88dc | 591 | else |
25024989 | 592 | cur_real_dev = fcoe->netdev; |
1d1b88dc | 593 | |
25024989 | 594 | list_for_each_entry(oldfcoe, &fcoe_hostlist, list) { |
25024989 CL |
595 | if (oldfcoe->netdev->priv_flags & IFF_802_1Q_VLAN) |
596 | old_real_dev = vlan_dev_real_dev(oldfcoe->netdev); | |
1d1b88dc | 597 | else |
25024989 | 598 | old_real_dev = oldfcoe->netdev; |
1d1b88dc VD |
599 | |
600 | if (cur_real_dev == old_real_dev) { | |
991cbb60 | 601 | fcoe->oem = oldfcoe->oem; |
d7179680 VD |
602 | break; |
603 | } | |
604 | } | |
605 | ||
991cbb60 CL |
606 | if (fcoe->oem) { |
607 | if (!fc_exch_mgr_add(lp, fcoe->oem, fcoe_oem_match)) { | |
d7179680 VD |
608 | printk(KERN_ERR "fcoe_em_config: failed to add " |
609 | "offload em:%p on interface:%s\n", | |
991cbb60 | 610 | fcoe->oem, fcoe->netdev->name); |
d7179680 VD |
611 | return -ENOMEM; |
612 | } | |
613 | } else { | |
991cbb60 | 614 | fcoe->oem = fc_exch_mgr_alloc(lp, FC_CLASS_3, |
d7179680 VD |
615 | FCOE_MIN_XID, lp->lro_xid, |
616 | fcoe_oem_match); | |
991cbb60 | 617 | if (!fcoe->oem) { |
d7179680 VD |
618 | printk(KERN_ERR "fcoe_em_config: failed to allocate " |
619 | "em for offload exches on interface:%s\n", | |
25024989 | 620 | fcoe->netdev->name); |
d7179680 VD |
621 | return -ENOMEM; |
622 | } | |
623 | } | |
624 | ||
625 | /* | |
626 | * Exclude offload EM xid range from next EM xid range. | |
627 | */ | |
628 | min_xid += lp->lro_xid + 1; | |
629 | ||
630 | skip_oem: | |
631 | if (!fc_exch_mgr_alloc(lp, FC_CLASS_3, min_xid, max_xid, NULL)) { | |
632 | printk(KERN_ERR "fcoe_em_config: failed to " | |
25024989 | 633 | "allocate em on interface %s\n", fcoe->netdev->name); |
7f349142 | 634 | return -ENOMEM; |
d7179680 | 635 | } |
7f349142 VD |
636 | |
637 | return 0; | |
638 | } | |
639 | ||
640 | /** | |
641 | * fcoe_if_destroy() - FCoE software HBA tear-down function | |
af7f85d9 | 642 | * @lport: fc_lport to destroy |
7f349142 | 643 | */ |
af7f85d9 | 644 | static void fcoe_if_destroy(struct fc_lport *lport) |
7f349142 | 645 | { |
014f5c3f CL |
646 | struct fcoe_port *port = lport_priv(lport); |
647 | struct fcoe_interface *fcoe = port->fcoe; | |
25024989 | 648 | struct net_device *netdev = fcoe->netdev; |
7f349142 | 649 | |
d5488eb9 | 650 | FCOE_NETDEV_DBG(netdev, "Destroying interface\n"); |
7f349142 | 651 | |
7f349142 | 652 | /* Logout of the fabric */ |
af7f85d9 | 653 | fc_fabric_logoff(lport); |
7f349142 | 654 | |
54b649f8 CL |
655 | /* Cleanup the fc_lport */ |
656 | fc_lport_destroy(lport); | |
657 | fc_fcp_destroy(lport); | |
658 | ||
659 | /* Stop the transmit retry timer */ | |
660 | del_timer_sync(&port->timer); | |
ab6b85c1 | 661 | |
54b649f8 CL |
662 | /* Free existing transmit skbs */ |
663 | fcoe_clean_pending_queue(lport); | |
664 | ||
11b56188 CL |
665 | rtnl_lock(); |
666 | if (!is_zero_ether_addr(port->data_src_addr)) | |
667 | dev_unicast_delete(netdev, port->data_src_addr); | |
668 | rtnl_unlock(); | |
669 | ||
54b649f8 CL |
670 | /* receives may not be stopped until after this */ |
671 | fcoe_interface_put(fcoe); | |
7f349142 | 672 | |
f161fb72 | 673 | /* Free queued packets for the per-CPU receive threads */ |
af7f85d9 | 674 | fcoe_percpu_clean(lport); |
f161fb72 | 675 | |
7f349142 | 676 | /* Detach from the scsi-ml */ |
af7f85d9 CL |
677 | fc_remove_host(lport->host); |
678 | scsi_remove_host(lport->host); | |
7f349142 VD |
679 | |
680 | /* There are no more rports or I/O, free the EM */ | |
af7f85d9 | 681 | fc_exch_mgr_free(lport); |
7f349142 | 682 | |
7f349142 | 683 | /* Free memory used by statistical counters */ |
af7f85d9 | 684 | fc_lport_free_stats(lport); |
7f349142 | 685 | |
2e70e241 | 686 | /* Release the Scsi_Host */ |
af7f85d9 | 687 | scsi_host_put(lport->host); |
7f349142 VD |
688 | } |
689 | ||
690 | /* | |
691 | * fcoe_ddp_setup - calls LLD's ddp_setup through net_device | |
692 | * @lp: the corresponding fc_lport | |
693 | * @xid: the exchange id for this ddp transfer | |
694 | * @sgl: the scatterlist describing this transfer | |
695 | * @sgc: number of sg items | |
696 | * | |
697 | * Returns : 0 no ddp | |
698 | */ | |
699 | static int fcoe_ddp_setup(struct fc_lport *lp, u16 xid, | |
700 | struct scatterlist *sgl, unsigned int sgc) | |
701 | { | |
702 | struct net_device *n = fcoe_netdev(lp); | |
703 | ||
b04d023c | 704 | if (n->netdev_ops->ndo_fcoe_ddp_setup) |
7f349142 VD |
705 | return n->netdev_ops->ndo_fcoe_ddp_setup(n, xid, sgl, sgc); |
706 | ||
707 | return 0; | |
708 | } | |
709 | ||
710 | /* | |
711 | * fcoe_ddp_done - calls LLD's ddp_done through net_device | |
712 | * @lp: the corresponding fc_lport | |
713 | * @xid: the exchange id for this ddp transfer | |
714 | * | |
715 | * Returns : the length of data that have been completed by ddp | |
716 | */ | |
717 | static int fcoe_ddp_done(struct fc_lport *lp, u16 xid) | |
718 | { | |
719 | struct net_device *n = fcoe_netdev(lp); | |
720 | ||
b04d023c | 721 | if (n->netdev_ops->ndo_fcoe_ddp_done) |
7f349142 VD |
722 | return n->netdev_ops->ndo_fcoe_ddp_done(n, xid); |
723 | return 0; | |
724 | } | |
725 | ||
11b56188 CL |
726 | static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, |
727 | u32 did, struct fc_frame *fp, unsigned int op, | |
728 | void (*resp)(struct fc_seq *, struct fc_frame *, void *), | |
729 | void *arg, u32 timeout); | |
730 | ||
7f349142 VD |
731 | static struct libfc_function_template fcoe_libfc_fcn_templ = { |
732 | .frame_send = fcoe_xmit, | |
733 | .ddp_setup = fcoe_ddp_setup, | |
734 | .ddp_done = fcoe_ddp_done, | |
11b56188 | 735 | .elsct_send = fcoe_elsct_send, |
7f349142 VD |
736 | }; |
737 | ||
738 | /** | |
030f4e00 CL |
739 | * fcoe_if_create() - this function creates the fcoe port |
740 | * @fcoe: fcoe_interface structure to create an fc_lport instance on | |
af7f85d9 | 741 | * @parent: device pointer to be the parent in sysfs for the SCSI host |
7f349142 | 742 | * |
54b649f8 | 743 | * Creates fc_lport struct and scsi_host for lport, configures lport. |
7f349142 | 744 | * |
af7f85d9 | 745 | * Returns : The allocated fc_lport or an error pointer |
7f349142 | 746 | */ |
030f4e00 | 747 | static struct fc_lport *fcoe_if_create(struct fcoe_interface *fcoe, |
af7f85d9 | 748 | struct device *parent) |
7f349142 VD |
749 | { |
750 | int rc; | |
af7f85d9 | 751 | struct fc_lport *lport = NULL; |
014f5c3f | 752 | struct fcoe_port *port; |
7f349142 | 753 | struct Scsi_Host *shost; |
030f4e00 | 754 | struct net_device *netdev = fcoe->netdev; |
7f349142 | 755 | |
d5488eb9 | 756 | FCOE_NETDEV_DBG(netdev, "Create Interface\n"); |
7f349142 | 757 | |
86221969 | 758 | lport = libfc_host_alloc(&fcoe_shost_template, |
014f5c3f | 759 | sizeof(struct fcoe_port)); |
86221969 | 760 | if (!lport) { |
d5488eb9 | 761 | FCOE_NETDEV_DBG(netdev, "Could not allocate host structure\n"); |
af7f85d9 | 762 | rc = -ENOMEM; |
030f4e00 | 763 | goto out; |
7f349142 | 764 | } |
86221969 | 765 | shost = lport->host; |
014f5c3f | 766 | port = lport_priv(lport); |
2e70e241 | 767 | port->lport = lport; |
014f5c3f | 768 | port->fcoe = fcoe; |
2e70e241 | 769 | INIT_WORK(&port->destroy_work, fcoe_destroy_work); |
7f349142 VD |
770 | |
771 | /* configure fc_lport, e.g., em */ | |
af7f85d9 | 772 | rc = fcoe_lport_config(lport); |
7f349142 | 773 | if (rc) { |
d5488eb9 RL |
774 | FCOE_NETDEV_DBG(netdev, "Could not configure lport for the " |
775 | "interface\n"); | |
7f349142 VD |
776 | goto out_host_put; |
777 | } | |
778 | ||
ab6b85c1 | 779 | /* configure lport network properties */ |
af7f85d9 | 780 | rc = fcoe_netdev_config(lport, netdev); |
ab6b85c1 | 781 | if (rc) { |
d5488eb9 RL |
782 | FCOE_NETDEV_DBG(netdev, "Could not configure netdev for the " |
783 | "interface\n"); | |
54b649f8 | 784 | goto out_lp_destroy; |
ab6b85c1 | 785 | } |
97c8389d | 786 | |
7f349142 | 787 | /* configure lport scsi host properties */ |
af7f85d9 | 788 | rc = fcoe_shost_config(lport, shost, parent); |
7f349142 | 789 | if (rc) { |
d5488eb9 RL |
790 | FCOE_NETDEV_DBG(netdev, "Could not configure shost for the " |
791 | "interface\n"); | |
54b649f8 | 792 | goto out_lp_destroy; |
7f349142 VD |
793 | } |
794 | ||
96316099 | 795 | /* Initialize the library */ |
af7f85d9 | 796 | rc = fcoe_libfc_config(lport, &fcoe_libfc_fcn_templ); |
7f349142 | 797 | if (rc) { |
96316099 | 798 | FCOE_NETDEV_DBG(netdev, "Could not configure libfc for the " |
d5488eb9 | 799 | "interface\n"); |
96316099 | 800 | goto out_lp_destroy; |
7f349142 VD |
801 | } |
802 | ||
e8af4d43 VD |
803 | /* |
804 | * fcoe_em_alloc() and fcoe_hostlist_add() both | |
c863df33 | 805 | * need to be atomic with respect to other changes to the hostlist |
e8af4d43 VD |
806 | * since fcoe_em_alloc() looks for an existing EM |
807 | * instance on host list updated by fcoe_hostlist_add(). | |
c863df33 CL |
808 | * |
809 | * This is currently handled through the fcoe_config_mutex begin held. | |
e8af4d43 | 810 | */ |
c863df33 | 811 | |
96316099 | 812 | /* lport exch manager allocation */ |
af7f85d9 | 813 | rc = fcoe_em_config(lport); |
7f349142 | 814 | if (rc) { |
96316099 | 815 | FCOE_NETDEV_DBG(netdev, "Could not configure the EM for the " |
d5488eb9 | 816 | "interface\n"); |
7f349142 VD |
817 | goto out_lp_destroy; |
818 | } | |
819 | ||
030f4e00 | 820 | fcoe_interface_get(fcoe); |
af7f85d9 | 821 | return lport; |
7f349142 VD |
822 | |
823 | out_lp_destroy: | |
af7f85d9 | 824 | fc_exch_mgr_free(lport); |
7f349142 | 825 | out_host_put: |
af7f85d9 CL |
826 | scsi_host_put(lport->host); |
827 | out: | |
828 | return ERR_PTR(rc); | |
7f349142 VD |
829 | } |
830 | ||
831 | /** | |
832 | * fcoe_if_init() - attach to scsi transport | |
833 | * | |
834 | * Returns : 0 on success | |
835 | */ | |
836 | static int __init fcoe_if_init(void) | |
837 | { | |
838 | /* attach to scsi transport */ | |
839 | scsi_transport_fcoe_sw = | |
840 | fc_attach_transport(&fcoe_transport_function); | |
841 | ||
842 | if (!scsi_transport_fcoe_sw) { | |
d5488eb9 | 843 | printk(KERN_ERR "fcoe: Failed to attach to the FC transport\n"); |
7f349142 VD |
844 | return -ENODEV; |
845 | } | |
846 | ||
847 | return 0; | |
848 | } | |
849 | ||
850 | /** | |
851 | * fcoe_if_exit() - detach from scsi transport | |
852 | * | |
853 | * Returns : 0 on success | |
854 | */ | |
855 | int __exit fcoe_if_exit(void) | |
856 | { | |
857 | fc_release_transport(scsi_transport_fcoe_sw); | |
dfc1d0fe | 858 | scsi_transport_fcoe_sw = NULL; |
7f349142 VD |
859 | return 0; |
860 | } | |
861 | ||
8976f424 RL |
862 | /** |
863 | * fcoe_percpu_thread_create() - Create a receive thread for an online cpu | |
864 | * @cpu: cpu index for the online cpu | |
865 | */ | |
866 | static void fcoe_percpu_thread_create(unsigned int cpu) | |
867 | { | |
868 | struct fcoe_percpu_s *p; | |
869 | struct task_struct *thread; | |
870 | ||
871 | p = &per_cpu(fcoe_percpu, cpu); | |
872 | ||
873 | thread = kthread_create(fcoe_percpu_receive_thread, | |
874 | (void *)p, "fcoethread/%d", cpu); | |
875 | ||
e7a51997 | 876 | if (likely(!IS_ERR(thread))) { |
8976f424 RL |
877 | kthread_bind(thread, cpu); |
878 | wake_up_process(thread); | |
879 | ||
880 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
881 | p->thread = thread; | |
882 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
883 | } | |
884 | } | |
885 | ||
886 | /** | |
887 | * fcoe_percpu_thread_destroy() - removes the rx thread for the given cpu | |
888 | * @cpu: cpu index the rx thread is to be removed | |
889 | * | |
890 | * Destroys a per-CPU Rx thread. Any pending skbs are moved to the | |
891 | * current CPU's Rx thread. If the thread being destroyed is bound to | |
892 | * the CPU processing this context the skbs will be freed. | |
893 | */ | |
894 | static void fcoe_percpu_thread_destroy(unsigned int cpu) | |
895 | { | |
896 | struct fcoe_percpu_s *p; | |
897 | struct task_struct *thread; | |
898 | struct page *crc_eof; | |
899 | struct sk_buff *skb; | |
900 | #ifdef CONFIG_SMP | |
901 | struct fcoe_percpu_s *p0; | |
902 | unsigned targ_cpu = smp_processor_id(); | |
903 | #endif /* CONFIG_SMP */ | |
904 | ||
d5488eb9 | 905 | FCOE_DBG("Destroying receive thread for CPU %d\n", cpu); |
8976f424 RL |
906 | |
907 | /* Prevent any new skbs from being queued for this CPU. */ | |
908 | p = &per_cpu(fcoe_percpu, cpu); | |
909 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
910 | thread = p->thread; | |
911 | p->thread = NULL; | |
912 | crc_eof = p->crc_eof_page; | |
913 | p->crc_eof_page = NULL; | |
914 | p->crc_eof_offset = 0; | |
915 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
916 | ||
917 | #ifdef CONFIG_SMP | |
918 | /* | |
919 | * Don't bother moving the skb's if this context is running | |
920 | * on the same CPU that is having its thread destroyed. This | |
921 | * can easily happen when the module is removed. | |
922 | */ | |
923 | if (cpu != targ_cpu) { | |
924 | p0 = &per_cpu(fcoe_percpu, targ_cpu); | |
925 | spin_lock_bh(&p0->fcoe_rx_list.lock); | |
926 | if (p0->thread) { | |
d5488eb9 RL |
927 | FCOE_DBG("Moving frames from CPU %d to CPU %d\n", |
928 | cpu, targ_cpu); | |
8976f424 RL |
929 | |
930 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
931 | __skb_queue_tail(&p0->fcoe_rx_list, skb); | |
932 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
933 | } else { | |
934 | /* | |
935 | * The targeted CPU is not initialized and cannot accept | |
936 | * new skbs. Unlock the targeted CPU and drop the skbs | |
937 | * on the CPU that is going offline. | |
938 | */ | |
939 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
940 | kfree_skb(skb); | |
941 | spin_unlock_bh(&p0->fcoe_rx_list.lock); | |
942 | } | |
943 | } else { | |
944 | /* | |
945 | * This scenario occurs when the module is being removed | |
946 | * and all threads are being destroyed. skbs will continue | |
947 | * to be shifted from the CPU thread that is being removed | |
948 | * to the CPU thread associated with the CPU that is processing | |
949 | * the module removal. Once there is only one CPU Rx thread it | |
950 | * will reach this case and we will drop all skbs and later | |
951 | * stop the thread. | |
952 | */ | |
953 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
954 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
955 | kfree_skb(skb); | |
956 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
957 | } | |
958 | #else | |
959 | /* | |
dd3fd72e | 960 | * This a non-SMP scenario where the singular Rx thread is |
8976f424 RL |
961 | * being removed. Free all skbs and stop the thread. |
962 | */ | |
963 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
964 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) != NULL) | |
965 | kfree_skb(skb); | |
966 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
967 | #endif | |
968 | ||
969 | if (thread) | |
970 | kthread_stop(thread); | |
971 | ||
972 | if (crc_eof) | |
973 | put_page(crc_eof); | |
974 | } | |
975 | ||
976 | /** | |
977 | * fcoe_cpu_callback() - fcoe cpu hotplug event callback | |
978 | * @nfb: callback data block | |
979 | * @action: event triggering the callback | |
980 | * @hcpu: index for the cpu of this event | |
981 | * | |
982 | * This creates or destroys per cpu data for fcoe | |
983 | * | |
984 | * Returns NOTIFY_OK always. | |
985 | */ | |
986 | static int fcoe_cpu_callback(struct notifier_block *nfb, | |
987 | unsigned long action, void *hcpu) | |
988 | { | |
989 | unsigned cpu = (unsigned long)hcpu; | |
990 | ||
991 | switch (action) { | |
992 | case CPU_ONLINE: | |
993 | case CPU_ONLINE_FROZEN: | |
d5488eb9 | 994 | FCOE_DBG("CPU %x online: Create Rx thread\n", cpu); |
8976f424 RL |
995 | fcoe_percpu_thread_create(cpu); |
996 | break; | |
997 | case CPU_DEAD: | |
998 | case CPU_DEAD_FROZEN: | |
d5488eb9 | 999 | FCOE_DBG("CPU %x offline: Remove Rx thread\n", cpu); |
8976f424 RL |
1000 | fcoe_percpu_thread_destroy(cpu); |
1001 | break; | |
1002 | default: | |
1003 | break; | |
1004 | } | |
1005 | return NOTIFY_OK; | |
1006 | } | |
1007 | ||
1008 | static struct notifier_block fcoe_cpu_notifier = { | |
1009 | .notifier_call = fcoe_cpu_callback, | |
1010 | }; | |
1011 | ||
85b4aa49 | 1012 | /** |
34f42a07 | 1013 | * fcoe_rcv() - this is the fcoe receive function called by NET_RX_SOFTIRQ |
85b4aa49 RL |
1014 | * @skb: the receive skb |
1015 | * @dev: associated net device | |
1016 | * @ptype: context | |
dd3fd72e | 1017 | * @olddev: last device |
85b4aa49 RL |
1018 | * |
1019 | * this function will receive the packet and build fc frame and pass it up | |
1020 | * | |
1021 | * Returns: 0 for success | |
34f42a07 | 1022 | */ |
85b4aa49 RL |
1023 | int fcoe_rcv(struct sk_buff *skb, struct net_device *dev, |
1024 | struct packet_type *ptype, struct net_device *olddev) | |
1025 | { | |
1026 | struct fc_lport *lp; | |
1027 | struct fcoe_rcv_info *fr; | |
259ad85d | 1028 | struct fcoe_interface *fcoe; |
85b4aa49 | 1029 | struct fc_frame_header *fh; |
85b4aa49 | 1030 | struct fcoe_percpu_s *fps; |
b2f0091f | 1031 | unsigned int cpu; |
85b4aa49 | 1032 | |
259ad85d | 1033 | fcoe = container_of(ptype, struct fcoe_interface, fcoe_packet_type); |
3fe9a0ba | 1034 | lp = fcoe->ctlr.lp; |
85b4aa49 | 1035 | if (unlikely(lp == NULL)) { |
d5488eb9 | 1036 | FCOE_NETDEV_DBG(dev, "Cannot find hba structure"); |
85b4aa49 RL |
1037 | goto err2; |
1038 | } | |
97c8389d JE |
1039 | if (!lp->link_up) |
1040 | goto err2; | |
85b4aa49 | 1041 | |
d5488eb9 RL |
1042 | FCOE_NETDEV_DBG(dev, "skb_info: len:%d data_len:%d head:%p " |
1043 | "data:%p tail:%p end:%p sum:%d dev:%s", | |
1044 | skb->len, skb->data_len, skb->head, skb->data, | |
1045 | skb_tail_pointer(skb), skb_end_pointer(skb), | |
1046 | skb->csum, skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1047 | |
1048 | /* check for FCOE packet type */ | |
1049 | if (unlikely(eth_hdr(skb)->h_proto != htons(ETH_P_FCOE))) { | |
d5488eb9 | 1050 | FCOE_NETDEV_DBG(dev, "Wrong FC type frame"); |
85b4aa49 RL |
1051 | goto err; |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * Check for minimum frame length, and make sure required FCoE | |
1056 | * and FC headers are pulled into the linear data area. | |
1057 | */ | |
1058 | if (unlikely((skb->len < FCOE_MIN_FRAME) || | |
1059 | !pskb_may_pull(skb, FCOE_HEADER_LEN))) | |
1060 | goto err; | |
1061 | ||
1062 | skb_set_transport_header(skb, sizeof(struct fcoe_hdr)); | |
1063 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1064 | ||
85b4aa49 RL |
1065 | fr = fcoe_dev_from_skb(skb); |
1066 | fr->fr_dev = lp; | |
1067 | fr->ptype = ptype; | |
5e5e92df | 1068 | |
85b4aa49 | 1069 | /* |
b2f0091f VD |
1070 | * In case the incoming frame's exchange is originated from |
1071 | * the initiator, then received frame's exchange id is ANDed | |
1072 | * with fc_cpu_mask bits to get the same cpu on which exchange | |
1073 | * was originated, otherwise just use the current cpu. | |
85b4aa49 | 1074 | */ |
b2f0091f VD |
1075 | if (ntoh24(fh->fh_f_ctl) & FC_FC_EX_CTX) |
1076 | cpu = ntohs(fh->fh_ox_id) & fc_cpu_mask; | |
1077 | else | |
1078 | cpu = smp_processor_id(); | |
5e5e92df | 1079 | |
8976f424 | 1080 | fps = &per_cpu(fcoe_percpu, cpu); |
85b4aa49 | 1081 | spin_lock_bh(&fps->fcoe_rx_list.lock); |
8976f424 RL |
1082 | if (unlikely(!fps->thread)) { |
1083 | /* | |
1084 | * The targeted CPU is not ready, let's target | |
1085 | * the first CPU now. For non-SMP systems this | |
1086 | * will check the same CPU twice. | |
1087 | */ | |
d5488eb9 RL |
1088 | FCOE_NETDEV_DBG(dev, "CPU is online, but no receive thread " |
1089 | "ready for incoming skb- using first online " | |
1090 | "CPU.\n"); | |
8976f424 RL |
1091 | |
1092 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1093 | cpu = first_cpu(cpu_online_map); | |
1094 | fps = &per_cpu(fcoe_percpu, cpu); | |
1095 | spin_lock_bh(&fps->fcoe_rx_list.lock); | |
1096 | if (!fps->thread) { | |
1097 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1098 | goto err; | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * We now have a valid CPU that we're targeting for | |
1104 | * this skb. We also have this receive thread locked, | |
1105 | * so we're free to queue skbs into it's queue. | |
1106 | */ | |
85b4aa49 RL |
1107 | __skb_queue_tail(&fps->fcoe_rx_list, skb); |
1108 | if (fps->fcoe_rx_list.qlen == 1) | |
1109 | wake_up_process(fps->thread); | |
1110 | ||
1111 | spin_unlock_bh(&fps->fcoe_rx_list.lock); | |
1112 | ||
1113 | return 0; | |
1114 | err: | |
582b45bc | 1115 | fc_lport_get_stats(lp)->ErrorFrames++; |
85b4aa49 RL |
1116 | |
1117 | err2: | |
1118 | kfree_skb(skb); | |
1119 | return -1; | |
1120 | } | |
85b4aa49 RL |
1121 | |
1122 | /** | |
34f42a07 | 1123 | * fcoe_start_io() - pass to netdev to start xmit for fcoe |
85b4aa49 RL |
1124 | * @skb: the skb to be xmitted |
1125 | * | |
1126 | * Returns: 0 for success | |
34f42a07 | 1127 | */ |
85b4aa49 RL |
1128 | static inline int fcoe_start_io(struct sk_buff *skb) |
1129 | { | |
1130 | int rc; | |
1131 | ||
1132 | skb_get(skb); | |
1133 | rc = dev_queue_xmit(skb); | |
1134 | if (rc != 0) | |
1135 | return rc; | |
1136 | kfree_skb(skb); | |
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | /** | |
dd3fd72e | 1141 | * fcoe_get_paged_crc_eof() - in case we need to alloc a page for crc_eof |
85b4aa49 RL |
1142 | * @skb: the skb to be xmitted |
1143 | * @tlen: total len | |
1144 | * | |
1145 | * Returns: 0 for success | |
34f42a07 | 1146 | */ |
85b4aa49 RL |
1147 | static int fcoe_get_paged_crc_eof(struct sk_buff *skb, int tlen) |
1148 | { | |
1149 | struct fcoe_percpu_s *fps; | |
1150 | struct page *page; | |
85b4aa49 | 1151 | |
5e5e92df | 1152 | fps = &get_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1153 | page = fps->crc_eof_page; |
1154 | if (!page) { | |
1155 | page = alloc_page(GFP_ATOMIC); | |
1156 | if (!page) { | |
5e5e92df | 1157 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1158 | return -ENOMEM; |
1159 | } | |
1160 | fps->crc_eof_page = page; | |
8976f424 | 1161 | fps->crc_eof_offset = 0; |
85b4aa49 RL |
1162 | } |
1163 | ||
1164 | get_page(page); | |
1165 | skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags, page, | |
1166 | fps->crc_eof_offset, tlen); | |
1167 | skb->len += tlen; | |
1168 | skb->data_len += tlen; | |
1169 | skb->truesize += tlen; | |
1170 | fps->crc_eof_offset += sizeof(struct fcoe_crc_eof); | |
1171 | ||
1172 | if (fps->crc_eof_offset >= PAGE_SIZE) { | |
1173 | fps->crc_eof_page = NULL; | |
1174 | fps->crc_eof_offset = 0; | |
1175 | put_page(page); | |
1176 | } | |
5e5e92df | 1177 | put_cpu_var(fcoe_percpu); |
85b4aa49 RL |
1178 | return 0; |
1179 | } | |
1180 | ||
1181 | /** | |
34f42a07 | 1182 | * fcoe_fc_crc() - calculates FC CRC in this fcoe skb |
dd3fd72e | 1183 | * @fp: the fc_frame containing data to be checksummed |
85b4aa49 | 1184 | * |
014f5c3f | 1185 | * This uses crc32() to calculate the crc for port frame |
85b4aa49 | 1186 | * Return : 32 bit crc |
34f42a07 | 1187 | */ |
85b4aa49 RL |
1188 | u32 fcoe_fc_crc(struct fc_frame *fp) |
1189 | { | |
1190 | struct sk_buff *skb = fp_skb(fp); | |
1191 | struct skb_frag_struct *frag; | |
1192 | unsigned char *data; | |
1193 | unsigned long off, len, clen; | |
1194 | u32 crc; | |
1195 | unsigned i; | |
1196 | ||
1197 | crc = crc32(~0, skb->data, skb_headlen(skb)); | |
1198 | ||
1199 | for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { | |
1200 | frag = &skb_shinfo(skb)->frags[i]; | |
1201 | off = frag->page_offset; | |
1202 | len = frag->size; | |
1203 | while (len > 0) { | |
1204 | clen = min(len, PAGE_SIZE - (off & ~PAGE_MASK)); | |
1205 | data = kmap_atomic(frag->page + (off >> PAGE_SHIFT), | |
1206 | KM_SKB_DATA_SOFTIRQ); | |
1207 | crc = crc32(crc, data + (off & ~PAGE_MASK), clen); | |
1208 | kunmap_atomic(data, KM_SKB_DATA_SOFTIRQ); | |
1209 | off += clen; | |
1210 | len -= clen; | |
1211 | } | |
1212 | } | |
1213 | return crc; | |
1214 | } | |
85b4aa49 RL |
1215 | |
1216 | /** | |
34f42a07 | 1217 | * fcoe_xmit() - FCoE frame transmit function |
014f5c3f | 1218 | * @lp: the associated local fcoe |
85b4aa49 RL |
1219 | * @fp: the fc_frame to be transmitted |
1220 | * | |
1221 | * Return : 0 for success | |
34f42a07 | 1222 | */ |
85b4aa49 RL |
1223 | int fcoe_xmit(struct fc_lport *lp, struct fc_frame *fp) |
1224 | { | |
4bb6b515 | 1225 | int wlen; |
85b4aa49 RL |
1226 | u32 crc; |
1227 | struct ethhdr *eh; | |
1228 | struct fcoe_crc_eof *cp; | |
1229 | struct sk_buff *skb; | |
1230 | struct fcoe_dev_stats *stats; | |
1231 | struct fc_frame_header *fh; | |
1232 | unsigned int hlen; /* header length implies the version */ | |
1233 | unsigned int tlen; /* trailer length */ | |
1234 | unsigned int elen; /* eth header, may include vlan */ | |
3fe9a0ba CL |
1235 | struct fcoe_port *port = lport_priv(lp); |
1236 | struct fcoe_interface *fcoe = port->fcoe; | |
85b4aa49 RL |
1237 | u8 sof, eof; |
1238 | struct fcoe_hdr *hp; | |
1239 | ||
1240 | WARN_ON((fr_len(fp) % sizeof(u32)) != 0); | |
1241 | ||
85b4aa49 | 1242 | fh = fc_frame_header_get(fp); |
97c8389d JE |
1243 | skb = fp_skb(fp); |
1244 | wlen = skb->len / FCOE_WORD_TO_BYTE; | |
1245 | ||
1246 | if (!lp->link_up) { | |
3caf02ee | 1247 | kfree_skb(skb); |
97c8389d | 1248 | return 0; |
85b4aa49 RL |
1249 | } |
1250 | ||
97c8389d | 1251 | if (unlikely(fh->fh_r_ctl == FC_RCTL_ELS_REQ) && |
11b56188 | 1252 | fcoe_ctlr_els_send(&fcoe->ctlr, lp, skb)) |
97c8389d JE |
1253 | return 0; |
1254 | ||
85b4aa49 RL |
1255 | sof = fr_sof(fp); |
1256 | eof = fr_eof(fp); | |
1257 | ||
4e57e1cb | 1258 | elen = sizeof(struct ethhdr); |
85b4aa49 RL |
1259 | hlen = sizeof(struct fcoe_hdr); |
1260 | tlen = sizeof(struct fcoe_crc_eof); | |
1261 | wlen = (skb->len - tlen + sizeof(crc)) / FCOE_WORD_TO_BYTE; | |
1262 | ||
1263 | /* crc offload */ | |
1264 | if (likely(lp->crc_offload)) { | |
39ca9a06 | 1265 | skb->ip_summed = CHECKSUM_PARTIAL; |
85b4aa49 RL |
1266 | skb->csum_start = skb_headroom(skb); |
1267 | skb->csum_offset = skb->len; | |
1268 | crc = 0; | |
1269 | } else { | |
1270 | skb->ip_summed = CHECKSUM_NONE; | |
1271 | crc = fcoe_fc_crc(fp); | |
1272 | } | |
1273 | ||
014f5c3f | 1274 | /* copy port crc and eof to the skb buff */ |
85b4aa49 RL |
1275 | if (skb_is_nonlinear(skb)) { |
1276 | skb_frag_t *frag; | |
1277 | if (fcoe_get_paged_crc_eof(skb, tlen)) { | |
e9041581 | 1278 | kfree_skb(skb); |
85b4aa49 RL |
1279 | return -ENOMEM; |
1280 | } | |
1281 | frag = &skb_shinfo(skb)->frags[skb_shinfo(skb)->nr_frags - 1]; | |
1282 | cp = kmap_atomic(frag->page, KM_SKB_DATA_SOFTIRQ) | |
1283 | + frag->page_offset; | |
1284 | } else { | |
1285 | cp = (struct fcoe_crc_eof *)skb_put(skb, tlen); | |
1286 | } | |
1287 | ||
1288 | memset(cp, 0, sizeof(*cp)); | |
1289 | cp->fcoe_eof = eof; | |
1290 | cp->fcoe_crc32 = cpu_to_le32(~crc); | |
1291 | ||
1292 | if (skb_is_nonlinear(skb)) { | |
1293 | kunmap_atomic(cp, KM_SKB_DATA_SOFTIRQ); | |
1294 | cp = NULL; | |
1295 | } | |
1296 | ||
014f5c3f | 1297 | /* adjust skb network/transport offsets to match mac/fcoe/port */ |
85b4aa49 RL |
1298 | skb_push(skb, elen + hlen); |
1299 | skb_reset_mac_header(skb); | |
1300 | skb_reset_network_header(skb); | |
1301 | skb->mac_len = elen; | |
211c738d | 1302 | skb->protocol = htons(ETH_P_FCOE); |
3fe9a0ba | 1303 | skb->dev = fcoe->netdev; |
85b4aa49 RL |
1304 | |
1305 | /* fill up mac and fcoe headers */ | |
1306 | eh = eth_hdr(skb); | |
1307 | eh->h_proto = htons(ETH_P_FCOE); | |
3fe9a0ba | 1308 | if (fcoe->ctlr.map_dest) |
85b4aa49 RL |
1309 | fc_fcoe_set_mac(eh->h_dest, fh->fh_d_id); |
1310 | else | |
1311 | /* insert GW address */ | |
3fe9a0ba | 1312 | memcpy(eh->h_dest, fcoe->ctlr.dest_addr, ETH_ALEN); |
85b4aa49 | 1313 | |
3fe9a0ba CL |
1314 | if (unlikely(fcoe->ctlr.flogi_oxid != FC_XID_UNKNOWN)) |
1315 | memcpy(eh->h_source, fcoe->ctlr.ctl_src_addr, ETH_ALEN); | |
85b4aa49 | 1316 | else |
11b56188 | 1317 | memcpy(eh->h_source, port->data_src_addr, ETH_ALEN); |
85b4aa49 RL |
1318 | |
1319 | hp = (struct fcoe_hdr *)(eh + 1); | |
1320 | memset(hp, 0, sizeof(*hp)); | |
1321 | if (FC_FCOE_VER) | |
1322 | FC_FCOE_ENCAPS_VER(hp, FC_FCOE_VER); | |
1323 | hp->fcoe_sof = sof; | |
1324 | ||
39ca9a06 YZ |
1325 | /* fcoe lso, mss is in max_payload which is non-zero for FCP data */ |
1326 | if (lp->seq_offload && fr_max_payload(fp)) { | |
1327 | skb_shinfo(skb)->gso_type = SKB_GSO_FCOE; | |
1328 | skb_shinfo(skb)->gso_size = fr_max_payload(fp); | |
1329 | } else { | |
1330 | skb_shinfo(skb)->gso_type = 0; | |
1331 | skb_shinfo(skb)->gso_size = 0; | |
1332 | } | |
85b4aa49 | 1333 | /* update tx stats: regardless if LLD fails */ |
582b45bc RL |
1334 | stats = fc_lport_get_stats(lp); |
1335 | stats->TxFrames++; | |
1336 | stats->TxWords += wlen; | |
85b4aa49 RL |
1337 | |
1338 | /* send down to lld */ | |
1339 | fr_dev(fp) = lp; | |
014f5c3f | 1340 | if (port->fcoe_pending_queue.qlen) |
4bb6b515 VD |
1341 | fcoe_check_wait_queue(lp, skb); |
1342 | else if (fcoe_start_io(skb)) | |
1343 | fcoe_check_wait_queue(lp, skb); | |
85b4aa49 RL |
1344 | |
1345 | return 0; | |
1346 | } | |
85b4aa49 | 1347 | |
e7a51997 JE |
1348 | /** |
1349 | * fcoe_percpu_flush_done() - Indicate percpu queue flush completion. | |
1350 | * @skb: the skb being completed. | |
1351 | */ | |
1352 | static void fcoe_percpu_flush_done(struct sk_buff *skb) | |
1353 | { | |
1354 | complete(&fcoe_flush_completion); | |
1355 | } | |
1356 | ||
34f42a07 RL |
1357 | /** |
1358 | * fcoe_percpu_receive_thread() - recv thread per cpu | |
85b4aa49 RL |
1359 | * @arg: ptr to the fcoe per cpu struct |
1360 | * | |
1361 | * Return: 0 for success | |
85b4aa49 RL |
1362 | */ |
1363 | int fcoe_percpu_receive_thread(void *arg) | |
1364 | { | |
1365 | struct fcoe_percpu_s *p = arg; | |
1366 | u32 fr_len; | |
1367 | struct fc_lport *lp; | |
1368 | struct fcoe_rcv_info *fr; | |
1369 | struct fcoe_dev_stats *stats; | |
1370 | struct fc_frame_header *fh; | |
1371 | struct sk_buff *skb; | |
1372 | struct fcoe_crc_eof crc_eof; | |
1373 | struct fc_frame *fp; | |
1374 | u8 *mac = NULL; | |
014f5c3f | 1375 | struct fcoe_port *port; |
85b4aa49 RL |
1376 | struct fcoe_hdr *hp; |
1377 | ||
4469c195 | 1378 | set_user_nice(current, -20); |
85b4aa49 RL |
1379 | |
1380 | while (!kthread_should_stop()) { | |
1381 | ||
1382 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1383 | while ((skb = __skb_dequeue(&p->fcoe_rx_list)) == NULL) { | |
1384 | set_current_state(TASK_INTERRUPTIBLE); | |
1385 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1386 | schedule(); | |
1387 | set_current_state(TASK_RUNNING); | |
1388 | if (kthread_should_stop()) | |
1389 | return 0; | |
1390 | spin_lock_bh(&p->fcoe_rx_list.lock); | |
1391 | } | |
1392 | spin_unlock_bh(&p->fcoe_rx_list.lock); | |
1393 | fr = fcoe_dev_from_skb(skb); | |
1394 | lp = fr->fr_dev; | |
1395 | if (unlikely(lp == NULL)) { | |
e7a51997 JE |
1396 | if (skb->destructor != fcoe_percpu_flush_done) |
1397 | FCOE_NETDEV_DBG(skb->dev, "NULL lport in skb"); | |
85b4aa49 RL |
1398 | kfree_skb(skb); |
1399 | continue; | |
1400 | } | |
1401 | ||
d5488eb9 RL |
1402 | FCOE_NETDEV_DBG(skb->dev, "skb_info: len:%d data_len:%d " |
1403 | "head:%p data:%p tail:%p end:%p sum:%d dev:%s", | |
1404 | skb->len, skb->data_len, | |
1405 | skb->head, skb->data, skb_tail_pointer(skb), | |
1406 | skb_end_pointer(skb), skb->csum, | |
1407 | skb->dev ? skb->dev->name : "<NULL>"); | |
85b4aa49 RL |
1408 | |
1409 | /* | |
1410 | * Save source MAC address before discarding header. | |
1411 | */ | |
014f5c3f | 1412 | port = lport_priv(lp); |
85b4aa49 RL |
1413 | if (skb_is_nonlinear(skb)) |
1414 | skb_linearize(skb); /* not ideal */ | |
97c8389d | 1415 | mac = eth_hdr(skb)->h_source; |
85b4aa49 RL |
1416 | |
1417 | /* | |
1418 | * Frame length checks and setting up the header pointers | |
1419 | * was done in fcoe_rcv already. | |
1420 | */ | |
1421 | hp = (struct fcoe_hdr *) skb_network_header(skb); | |
1422 | fh = (struct fc_frame_header *) skb_transport_header(skb); | |
1423 | ||
582b45bc | 1424 | stats = fc_lport_get_stats(lp); |
85b4aa49 | 1425 | if (unlikely(FC_FCOE_DECAPS_VER(hp) != FC_FCOE_VER)) { |
582b45bc | 1426 | if (stats->ErrorFrames < 5) |
d5488eb9 | 1427 | printk(KERN_WARNING "fcoe: FCoE version " |
582b45bc RL |
1428 | "mismatch: The frame has " |
1429 | "version %x, but the " | |
1430 | "initiator supports version " | |
1431 | "%x\n", FC_FCOE_DECAPS_VER(hp), | |
1432 | FC_FCOE_VER); | |
1433 | stats->ErrorFrames++; | |
85b4aa49 RL |
1434 | kfree_skb(skb); |
1435 | continue; | |
1436 | } | |
1437 | ||
1438 | skb_pull(skb, sizeof(struct fcoe_hdr)); | |
1439 | fr_len = skb->len - sizeof(struct fcoe_crc_eof); | |
1440 | ||
582b45bc RL |
1441 | stats->RxFrames++; |
1442 | stats->RxWords += fr_len / FCOE_WORD_TO_BYTE; | |
85b4aa49 RL |
1443 | |
1444 | fp = (struct fc_frame *)skb; | |
1445 | fc_frame_init(fp); | |
1446 | fr_dev(fp) = lp; | |
1447 | fr_sof(fp) = hp->fcoe_sof; | |
1448 | ||
1449 | /* Copy out the CRC and EOF trailer for access */ | |
1450 | if (skb_copy_bits(skb, fr_len, &crc_eof, sizeof(crc_eof))) { | |
1451 | kfree_skb(skb); | |
1452 | continue; | |
1453 | } | |
1454 | fr_eof(fp) = crc_eof.fcoe_eof; | |
1455 | fr_crc(fp) = crc_eof.fcoe_crc32; | |
1456 | if (pskb_trim(skb, fr_len)) { | |
1457 | kfree_skb(skb); | |
1458 | continue; | |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * We only check CRC if no offload is available and if it is | |
1463 | * it's solicited data, in which case, the FCP layer would | |
1464 | * check it during the copy. | |
1465 | */ | |
07c00ec4 | 1466 | if (lp->crc_offload && skb->ip_summed == CHECKSUM_UNNECESSARY) |
85b4aa49 RL |
1467 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; |
1468 | else | |
1469 | fr_flags(fp) |= FCPHF_CRC_UNCHECKED; | |
1470 | ||
1471 | fh = fc_frame_header_get(fp); | |
1472 | if (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA && | |
1473 | fh->fh_type == FC_TYPE_FCP) { | |
52ff878c | 1474 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1475 | continue; |
1476 | } | |
1477 | if (fr_flags(fp) & FCPHF_CRC_UNCHECKED) { | |
1478 | if (le32_to_cpu(fr_crc(fp)) != | |
1479 | ~crc32(~0, skb->data, fr_len)) { | |
d5488eb9 | 1480 | if (stats->InvalidCRCCount < 5) |
85b4aa49 RL |
1481 | printk(KERN_WARNING "fcoe: dropping " |
1482 | "frame with CRC error\n"); | |
1483 | stats->InvalidCRCCount++; | |
1484 | stats->ErrorFrames++; | |
1485 | fc_frame_free(fp); | |
1486 | continue; | |
1487 | } | |
1488 | fr_flags(fp) &= ~FCPHF_CRC_UNCHECKED; | |
1489 | } | |
52ff878c | 1490 | fc_exch_recv(lp, fp); |
85b4aa49 RL |
1491 | } |
1492 | return 0; | |
1493 | } | |
1494 | ||
85b4aa49 | 1495 | /** |
dd3fd72e CL |
1496 | * fcoe_check_wait_queue() - attempt to clear the transmit backlog |
1497 | * @lp: the fc_lport | |
85b4aa49 RL |
1498 | * |
1499 | * This empties the wait_queue, dequeue the head of the wait_queue queue | |
1500 | * and calls fcoe_start_io() for each packet, if all skb have been | |
c826a314 | 1501 | * transmitted, return qlen or -1 if a error occurs, then restore |
dd3fd72e | 1502 | * wait_queue and try again later. |
85b4aa49 RL |
1503 | * |
1504 | * The wait_queue is used when the skb transmit fails. skb will go | |
dd3fd72e | 1505 | * in the wait_queue which will be emptied by the timer function or |
85b4aa49 | 1506 | * by the next skb transmit. |
34f42a07 | 1507 | */ |
4bb6b515 | 1508 | static void fcoe_check_wait_queue(struct fc_lport *lp, struct sk_buff *skb) |
85b4aa49 | 1509 | { |
014f5c3f | 1510 | struct fcoe_port *port = lport_priv(lp); |
4bb6b515 | 1511 | int rc; |
85b4aa49 | 1512 | |
014f5c3f | 1513 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
4bb6b515 VD |
1514 | |
1515 | if (skb) | |
014f5c3f | 1516 | __skb_queue_tail(&port->fcoe_pending_queue, skb); |
4bb6b515 | 1517 | |
014f5c3f | 1518 | if (port->fcoe_pending_queue_active) |
c826a314 | 1519 | goto out; |
014f5c3f | 1520 | port->fcoe_pending_queue_active = 1; |
55c8bafb | 1521 | |
014f5c3f | 1522 | while (port->fcoe_pending_queue.qlen) { |
55c8bafb | 1523 | /* keep qlen > 0 until fcoe_start_io succeeds */ |
014f5c3f CL |
1524 | port->fcoe_pending_queue.qlen++; |
1525 | skb = __skb_dequeue(&port->fcoe_pending_queue); | |
55c8bafb | 1526 | |
014f5c3f | 1527 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
55c8bafb | 1528 | rc = fcoe_start_io(skb); |
014f5c3f | 1529 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
55c8bafb CL |
1530 | |
1531 | if (rc) { | |
014f5c3f | 1532 | __skb_queue_head(&port->fcoe_pending_queue, skb); |
55c8bafb | 1533 | /* undo temporary increment above */ |
014f5c3f | 1534 | port->fcoe_pending_queue.qlen--; |
55c8bafb | 1535 | break; |
85b4aa49 | 1536 | } |
55c8bafb | 1537 | /* undo temporary increment above */ |
014f5c3f | 1538 | port->fcoe_pending_queue.qlen--; |
85b4aa49 | 1539 | } |
55c8bafb | 1540 | |
014f5c3f | 1541 | if (port->fcoe_pending_queue.qlen < FCOE_LOW_QUEUE_DEPTH) |
55c8bafb | 1542 | lp->qfull = 0; |
014f5c3f CL |
1543 | if (port->fcoe_pending_queue.qlen && !timer_pending(&port->timer)) |
1544 | mod_timer(&port->timer, jiffies + 2); | |
1545 | port->fcoe_pending_queue_active = 0; | |
c826a314 | 1546 | out: |
014f5c3f | 1547 | if (port->fcoe_pending_queue.qlen > FCOE_MAX_QUEUE_DEPTH) |
4bb6b515 | 1548 | lp->qfull = 1; |
014f5c3f | 1549 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
4bb6b515 | 1550 | return; |
85b4aa49 RL |
1551 | } |
1552 | ||
85b4aa49 | 1553 | /** |
34f42a07 RL |
1554 | * fcoe_dev_setup() - setup link change notification interface |
1555 | */ | |
b0d428ad | 1556 | static void fcoe_dev_setup(void) |
85b4aa49 | 1557 | { |
85b4aa49 RL |
1558 | register_netdevice_notifier(&fcoe_notifier); |
1559 | } | |
1560 | ||
1561 | /** | |
b0d428ad | 1562 | * fcoe_dev_cleanup() - cleanup link change notification interface |
34f42a07 | 1563 | */ |
85b4aa49 RL |
1564 | static void fcoe_dev_cleanup(void) |
1565 | { | |
1566 | unregister_netdevice_notifier(&fcoe_notifier); | |
1567 | } | |
1568 | ||
1569 | /** | |
34f42a07 | 1570 | * fcoe_device_notification() - netdev event notification callback |
85b4aa49 RL |
1571 | * @notifier: context of the notification |
1572 | * @event: type of event | |
1573 | * @ptr: fixed array for output parsed ifname | |
1574 | * | |
1575 | * This function is called by the ethernet driver in case of link change event | |
1576 | * | |
1577 | * Returns: 0 for success | |
34f42a07 | 1578 | */ |
85b4aa49 RL |
1579 | static int fcoe_device_notification(struct notifier_block *notifier, |
1580 | ulong event, void *ptr) | |
1581 | { | |
1582 | struct fc_lport *lp = NULL; | |
1d1b88dc | 1583 | struct net_device *netdev = ptr; |
014f5c3f | 1584 | struct fcoe_interface *fcoe; |
2e70e241 | 1585 | struct fcoe_port *port; |
85b4aa49 | 1586 | struct fcoe_dev_stats *stats; |
97c8389d | 1587 | u32 link_possible = 1; |
85b4aa49 RL |
1588 | u32 mfs; |
1589 | int rc = NOTIFY_OK; | |
1590 | ||
014f5c3f | 1591 | list_for_each_entry(fcoe, &fcoe_hostlist, list) { |
25024989 | 1592 | if (fcoe->netdev == netdev) { |
3fe9a0ba | 1593 | lp = fcoe->ctlr.lp; |
85b4aa49 RL |
1594 | break; |
1595 | } | |
1596 | } | |
85b4aa49 RL |
1597 | if (lp == NULL) { |
1598 | rc = NOTIFY_DONE; | |
1599 | goto out; | |
1600 | } | |
1601 | ||
85b4aa49 RL |
1602 | switch (event) { |
1603 | case NETDEV_DOWN: | |
1604 | case NETDEV_GOING_DOWN: | |
97c8389d | 1605 | link_possible = 0; |
85b4aa49 RL |
1606 | break; |
1607 | case NETDEV_UP: | |
1608 | case NETDEV_CHANGE: | |
85b4aa49 RL |
1609 | break; |
1610 | case NETDEV_CHANGEMTU: | |
7221d7e5 YZ |
1611 | if (netdev->features & NETIF_F_FCOE_MTU) |
1612 | break; | |
1d1b88dc VD |
1613 | mfs = netdev->mtu - (sizeof(struct fcoe_hdr) + |
1614 | sizeof(struct fcoe_crc_eof)); | |
85b4aa49 RL |
1615 | if (mfs >= FC_MIN_MAX_FRAME) |
1616 | fc_set_mfs(lp, mfs); | |
85b4aa49 RL |
1617 | break; |
1618 | case NETDEV_REGISTER: | |
1619 | break; | |
2e70e241 CL |
1620 | case NETDEV_UNREGISTER: |
1621 | list_del(&fcoe->list); | |
1622 | port = lport_priv(fcoe->ctlr.lp); | |
1623 | fcoe_interface_cleanup(fcoe); | |
1624 | schedule_work(&port->destroy_work); | |
1625 | goto out; | |
1626 | break; | |
85b4aa49 | 1627 | default: |
1d1b88dc | 1628 | FCOE_NETDEV_DBG(netdev, "Unknown event %ld " |
d5488eb9 | 1629 | "from netdev netlink\n", event); |
85b4aa49 | 1630 | } |
97c8389d | 1631 | if (link_possible && !fcoe_link_ok(lp)) |
3fe9a0ba CL |
1632 | fcoe_ctlr_link_up(&fcoe->ctlr); |
1633 | else if (fcoe_ctlr_link_down(&fcoe->ctlr)) { | |
97c8389d JE |
1634 | stats = fc_lport_get_stats(lp); |
1635 | stats->LinkFailureCount++; | |
1636 | fcoe_clean_pending_queue(lp); | |
85b4aa49 RL |
1637 | } |
1638 | out: | |
1639 | return rc; | |
1640 | } | |
1641 | ||
1642 | /** | |
34f42a07 | 1643 | * fcoe_if_to_netdev() - parse a name buffer to get netdev |
85b4aa49 RL |
1644 | * @buffer: incoming buffer to be copied |
1645 | * | |
dd3fd72e | 1646 | * Returns: NULL or ptr to net_device |
34f42a07 | 1647 | */ |
85b4aa49 RL |
1648 | static struct net_device *fcoe_if_to_netdev(const char *buffer) |
1649 | { | |
1650 | char *cp; | |
1651 | char ifname[IFNAMSIZ + 2]; | |
1652 | ||
1653 | if (buffer) { | |
1654 | strlcpy(ifname, buffer, IFNAMSIZ); | |
1655 | cp = ifname + strlen(ifname); | |
1656 | while (--cp >= ifname && *cp == '\n') | |
1657 | *cp = '\0'; | |
1658 | return dev_get_by_name(&init_net, ifname); | |
1659 | } | |
1660 | return NULL; | |
1661 | } | |
1662 | ||
85b4aa49 | 1663 | /** |
34f42a07 | 1664 | * fcoe_destroy() - handles the destroy from sysfs |
dd3fd72e | 1665 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1666 | * @kp: associated kernel param |
1667 | * | |
1668 | * Returns: 0 for success | |
34f42a07 | 1669 | */ |
85b4aa49 RL |
1670 | static int fcoe_destroy(const char *buffer, struct kernel_param *kp) |
1671 | { | |
030f4e00 | 1672 | struct fcoe_interface *fcoe; |
2e70e241 | 1673 | struct net_device *netdev; |
8eca355f | 1674 | int rc = 0; |
85b4aa49 | 1675 | |
dfc1d0fe CL |
1676 | mutex_lock(&fcoe_config_mutex); |
1677 | #ifdef CONFIG_FCOE_MODULE | |
1678 | /* | |
1679 | * Make sure the module has been initialized, and is not about to be | |
1680 | * removed. Module paramter sysfs files are writable before the | |
1681 | * module_init function is called and after module_exit. | |
1682 | */ | |
1683 | if (THIS_MODULE->state != MODULE_STATE_LIVE) { | |
1684 | rc = -ENODEV; | |
1685 | goto out_nodev; | |
1686 | } | |
1687 | #endif | |
1688 | ||
85b4aa49 RL |
1689 | netdev = fcoe_if_to_netdev(buffer); |
1690 | if (!netdev) { | |
1691 | rc = -ENODEV; | |
1692 | goto out_nodev; | |
1693 | } | |
2e70e241 | 1694 | |
090eb6c4 | 1695 | rtnl_lock(); |
2e70e241 CL |
1696 | fcoe = fcoe_hostlist_lookup_port(netdev); |
1697 | if (!fcoe) { | |
090eb6c4 | 1698 | rtnl_unlock(); |
85b4aa49 RL |
1699 | rc = -ENODEV; |
1700 | goto out_putdev; | |
1701 | } | |
2e70e241 | 1702 | list_del(&fcoe->list); |
2e70e241 CL |
1703 | fcoe_interface_cleanup(fcoe); |
1704 | rtnl_unlock(); | |
1705 | fcoe_if_destroy(fcoe->ctlr.lp); | |
85b4aa49 RL |
1706 | out_putdev: |
1707 | dev_put(netdev); | |
1708 | out_nodev: | |
dfc1d0fe | 1709 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 RL |
1710 | return rc; |
1711 | } | |
1712 | ||
2e70e241 CL |
1713 | static void fcoe_destroy_work(struct work_struct *work) |
1714 | { | |
1715 | struct fcoe_port *port; | |
1716 | ||
1717 | port = container_of(work, struct fcoe_port, destroy_work); | |
1718 | mutex_lock(&fcoe_config_mutex); | |
1719 | fcoe_if_destroy(port->lport); | |
1720 | mutex_unlock(&fcoe_config_mutex); | |
1721 | } | |
1722 | ||
85b4aa49 | 1723 | /** |
34f42a07 | 1724 | * fcoe_create() - Handles the create call from sysfs |
dd3fd72e | 1725 | * @buffer: expected to be an eth if name |
85b4aa49 RL |
1726 | * @kp: associated kernel param |
1727 | * | |
1728 | * Returns: 0 for success | |
34f42a07 | 1729 | */ |
85b4aa49 RL |
1730 | static int fcoe_create(const char *buffer, struct kernel_param *kp) |
1731 | { | |
1732 | int rc; | |
030f4e00 | 1733 | struct fcoe_interface *fcoe; |
af7f85d9 | 1734 | struct fc_lport *lport; |
85b4aa49 RL |
1735 | struct net_device *netdev; |
1736 | ||
dfc1d0fe CL |
1737 | mutex_lock(&fcoe_config_mutex); |
1738 | #ifdef CONFIG_FCOE_MODULE | |
1739 | /* | |
1740 | * Make sure the module has been initialized, and is not about to be | |
1741 | * removed. Module paramter sysfs files are writable before the | |
1742 | * module_init function is called and after module_exit. | |
1743 | */ | |
1744 | if (THIS_MODULE->state != MODULE_STATE_LIVE) { | |
1745 | rc = -ENODEV; | |
1746 | goto out_nodev; | |
1747 | } | |
1748 | #endif | |
1749 | ||
2e70e241 | 1750 | rtnl_lock(); |
85b4aa49 RL |
1751 | netdev = fcoe_if_to_netdev(buffer); |
1752 | if (!netdev) { | |
1753 | rc = -ENODEV; | |
1754 | goto out_nodev; | |
1755 | } | |
2e70e241 | 1756 | |
85b4aa49 RL |
1757 | /* look for existing lport */ |
1758 | if (fcoe_hostlist_lookup(netdev)) { | |
1759 | rc = -EEXIST; | |
1760 | goto out_putdev; | |
1761 | } | |
85b4aa49 | 1762 | |
030f4e00 CL |
1763 | fcoe = fcoe_interface_create(netdev); |
1764 | if (!fcoe) { | |
1765 | rc = -ENOMEM; | |
1766 | goto out_putdev; | |
1767 | } | |
1768 | ||
1769 | lport = fcoe_if_create(fcoe, &netdev->dev); | |
af7f85d9 | 1770 | if (IS_ERR(lport)) { |
d5488eb9 | 1771 | printk(KERN_ERR "fcoe: Failed to create interface (%s)\n", |
85b4aa49 | 1772 | netdev->name); |
85b4aa49 | 1773 | rc = -EIO; |
2e70e241 | 1774 | fcoe_interface_cleanup(fcoe); |
030f4e00 | 1775 | goto out_free; |
85b4aa49 | 1776 | } |
030f4e00 | 1777 | |
54b649f8 CL |
1778 | /* Make this the "master" N_Port */ |
1779 | fcoe->ctlr.lp = lport; | |
1780 | ||
c863df33 CL |
1781 | /* add to lports list */ |
1782 | fcoe_hostlist_add(lport); | |
1783 | ||
54b649f8 CL |
1784 | /* start FIP Discovery and FLOGI */ |
1785 | lport->boot_time = jiffies; | |
1786 | fc_fabric_login(lport); | |
1787 | if (!fcoe_link_ok(lport)) | |
1788 | fcoe_ctlr_link_up(&fcoe->ctlr); | |
030f4e00 | 1789 | |
54b649f8 | 1790 | rc = 0; |
030f4e00 | 1791 | out_free: |
54b649f8 CL |
1792 | /* |
1793 | * Release from init in fcoe_interface_create(), on success lport | |
1794 | * should be holding a reference taken in fcoe_if_create(). | |
1795 | */ | |
030f4e00 | 1796 | fcoe_interface_put(fcoe); |
85b4aa49 RL |
1797 | out_putdev: |
1798 | dev_put(netdev); | |
1799 | out_nodev: | |
2e70e241 | 1800 | rtnl_unlock(); |
dfc1d0fe | 1801 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 RL |
1802 | return rc; |
1803 | } | |
1804 | ||
1805 | module_param_call(create, fcoe_create, NULL, NULL, S_IWUSR); | |
1806 | __MODULE_PARM_TYPE(create, "string"); | |
014f5c3f | 1807 | MODULE_PARM_DESC(create, "Create fcoe fcoe using net device passed in."); |
85b4aa49 RL |
1808 | module_param_call(destroy, fcoe_destroy, NULL, NULL, S_IWUSR); |
1809 | __MODULE_PARM_TYPE(destroy, "string"); | |
014f5c3f | 1810 | MODULE_PARM_DESC(destroy, "Destroy fcoe fcoe"); |
85b4aa49 | 1811 | |
34f42a07 RL |
1812 | /** |
1813 | * fcoe_link_ok() - Check if link is ok for the fc_lport | |
85b4aa49 RL |
1814 | * @lp: ptr to the fc_lport |
1815 | * | |
1816 | * Any permanently-disqualifying conditions have been previously checked. | |
1817 | * This also updates the speed setting, which may change with link for 100/1000. | |
1818 | * | |
1819 | * This function should probably be checking for PAUSE support at some point | |
1820 | * in the future. Currently Per-priority-pause is not determinable using | |
1821 | * ethtool, so we shouldn't be restrictive until that problem is resolved. | |
1822 | * | |
1823 | * Returns: 0 if link is OK for use by FCoE. | |
1824 | * | |
1825 | */ | |
1826 | int fcoe_link_ok(struct fc_lport *lp) | |
1827 | { | |
014f5c3f | 1828 | struct fcoe_port *port = lport_priv(lp); |
25024989 | 1829 | struct net_device *dev = port->fcoe->netdev; |
85b4aa49 | 1830 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
85b4aa49 | 1831 | |
2f718d64 YZ |
1832 | if ((dev->flags & IFF_UP) && netif_carrier_ok(dev) && |
1833 | (!dev_ethtool_get_settings(dev, &ecmd))) { | |
1834 | lp->link_supported_speeds &= | |
1835 | ~(FC_PORTSPEED_1GBIT | FC_PORTSPEED_10GBIT); | |
1836 | if (ecmd.supported & (SUPPORTED_1000baseT_Half | | |
1837 | SUPPORTED_1000baseT_Full)) | |
1838 | lp->link_supported_speeds |= FC_PORTSPEED_1GBIT; | |
1839 | if (ecmd.supported & SUPPORTED_10000baseT_Full) | |
1840 | lp->link_supported_speeds |= | |
1841 | FC_PORTSPEED_10GBIT; | |
1842 | if (ecmd.speed == SPEED_1000) | |
1843 | lp->link_speed = FC_PORTSPEED_1GBIT; | |
1844 | if (ecmd.speed == SPEED_10000) | |
1845 | lp->link_speed = FC_PORTSPEED_10GBIT; | |
85b4aa49 | 1846 | |
2f718d64 YZ |
1847 | return 0; |
1848 | } | |
1849 | return -1; | |
85b4aa49 | 1850 | } |
85b4aa49 | 1851 | |
34f42a07 RL |
1852 | /** |
1853 | * fcoe_percpu_clean() - Clear the pending skbs for an lport | |
85b4aa49 | 1854 | * @lp: the fc_lport |
e7a51997 JE |
1855 | * |
1856 | * Must be called with fcoe_create_mutex held to single-thread completion. | |
1857 | * | |
1858 | * This flushes the pending skbs by adding a new skb to each queue and | |
1859 | * waiting until they are all freed. This assures us that not only are | |
1860 | * there no packets that will be handled by the lport, but also that any | |
1861 | * threads already handling packet have returned. | |
85b4aa49 RL |
1862 | */ |
1863 | void fcoe_percpu_clean(struct fc_lport *lp) | |
1864 | { | |
85b4aa49 RL |
1865 | struct fcoe_percpu_s *pp; |
1866 | struct fcoe_rcv_info *fr; | |
1867 | struct sk_buff_head *list; | |
1868 | struct sk_buff *skb, *next; | |
1869 | struct sk_buff *head; | |
5e5e92df | 1870 | unsigned int cpu; |
85b4aa49 | 1871 | |
5e5e92df RL |
1872 | for_each_possible_cpu(cpu) { |
1873 | pp = &per_cpu(fcoe_percpu, cpu); | |
1874 | spin_lock_bh(&pp->fcoe_rx_list.lock); | |
1875 | list = &pp->fcoe_rx_list; | |
1876 | head = list->next; | |
1877 | for (skb = head; skb != (struct sk_buff *)list; | |
1878 | skb = next) { | |
1879 | next = skb->next; | |
1880 | fr = fcoe_dev_from_skb(skb); | |
1881 | if (fr->fr_dev == lp) { | |
1882 | __skb_unlink(skb, list); | |
1883 | kfree_skb(skb); | |
85b4aa49 | 1884 | } |
85b4aa49 | 1885 | } |
e7a51997 JE |
1886 | |
1887 | if (!pp->thread || !cpu_online(cpu)) { | |
1888 | spin_unlock_bh(&pp->fcoe_rx_list.lock); | |
1889 | continue; | |
1890 | } | |
1891 | ||
1892 | skb = dev_alloc_skb(0); | |
1893 | if (!skb) { | |
1894 | spin_unlock_bh(&pp->fcoe_rx_list.lock); | |
1895 | continue; | |
1896 | } | |
1897 | skb->destructor = fcoe_percpu_flush_done; | |
1898 | ||
1899 | __skb_queue_tail(&pp->fcoe_rx_list, skb); | |
1900 | if (pp->fcoe_rx_list.qlen == 1) | |
1901 | wake_up_process(pp->thread); | |
5e5e92df | 1902 | spin_unlock_bh(&pp->fcoe_rx_list.lock); |
e7a51997 JE |
1903 | |
1904 | wait_for_completion(&fcoe_flush_completion); | |
85b4aa49 RL |
1905 | } |
1906 | } | |
85b4aa49 RL |
1907 | |
1908 | /** | |
34f42a07 | 1909 | * fcoe_clean_pending_queue() - Dequeue a skb and free it |
85b4aa49 RL |
1910 | * @lp: the corresponding fc_lport |
1911 | * | |
1912 | * Returns: none | |
34f42a07 | 1913 | */ |
85b4aa49 RL |
1914 | void fcoe_clean_pending_queue(struct fc_lport *lp) |
1915 | { | |
014f5c3f | 1916 | struct fcoe_port *port = lport_priv(lp); |
85b4aa49 RL |
1917 | struct sk_buff *skb; |
1918 | ||
014f5c3f CL |
1919 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
1920 | while ((skb = __skb_dequeue(&port->fcoe_pending_queue)) != NULL) { | |
1921 | spin_unlock_bh(&port->fcoe_pending_queue.lock); | |
85b4aa49 | 1922 | kfree_skb(skb); |
014f5c3f | 1923 | spin_lock_bh(&port->fcoe_pending_queue.lock); |
85b4aa49 | 1924 | } |
014f5c3f | 1925 | spin_unlock_bh(&port->fcoe_pending_queue.lock); |
85b4aa49 | 1926 | } |
85b4aa49 | 1927 | |
34f42a07 RL |
1928 | /** |
1929 | * fcoe_reset() - Resets the fcoe | |
85b4aa49 RL |
1930 | * @shost: shost the reset is from |
1931 | * | |
1932 | * Returns: always 0 | |
1933 | */ | |
1934 | int fcoe_reset(struct Scsi_Host *shost) | |
1935 | { | |
1936 | struct fc_lport *lport = shost_priv(shost); | |
1937 | fc_lport_reset(lport); | |
1938 | return 0; | |
1939 | } | |
85b4aa49 | 1940 | |
34f42a07 | 1941 | /** |
014f5c3f | 1942 | * fcoe_hostlist_lookup_port() - find the corresponding lport by a given device |
dd3fd72e | 1943 | * @dev: this is currently ptr to net_device |
85b4aa49 | 1944 | * |
014f5c3f | 1945 | * Returns: NULL or the located fcoe_port |
090eb6c4 | 1946 | * Locking: must be called with the RNL mutex held |
85b4aa49 | 1947 | */ |
014f5c3f CL |
1948 | static struct fcoe_interface * |
1949 | fcoe_hostlist_lookup_port(const struct net_device *dev) | |
85b4aa49 | 1950 | { |
014f5c3f | 1951 | struct fcoe_interface *fcoe; |
85b4aa49 | 1952 | |
014f5c3f | 1953 | list_for_each_entry(fcoe, &fcoe_hostlist, list) { |
25024989 | 1954 | if (fcoe->netdev == dev) |
014f5c3f | 1955 | return fcoe; |
85b4aa49 | 1956 | } |
85b4aa49 RL |
1957 | return NULL; |
1958 | } | |
1959 | ||
34f42a07 RL |
1960 | /** |
1961 | * fcoe_hostlist_lookup() - Find the corresponding lport by netdev | |
85b4aa49 RL |
1962 | * @netdev: ptr to net_device |
1963 | * | |
1964 | * Returns: 0 for success | |
090eb6c4 | 1965 | * Locking: must be called with the RTNL mutex held |
85b4aa49 | 1966 | */ |
090eb6c4 | 1967 | static struct fc_lport *fcoe_hostlist_lookup(const struct net_device *netdev) |
85b4aa49 | 1968 | { |
014f5c3f | 1969 | struct fcoe_interface *fcoe; |
85b4aa49 | 1970 | |
014f5c3f | 1971 | fcoe = fcoe_hostlist_lookup_port(netdev); |
3fe9a0ba | 1972 | return (fcoe) ? fcoe->ctlr.lp : NULL; |
85b4aa49 | 1973 | } |
85b4aa49 | 1974 | |
34f42a07 RL |
1975 | /** |
1976 | * fcoe_hostlist_add() - Add a lport to lports list | |
dd3fd72e | 1977 | * @lp: ptr to the fc_lport to be added |
85b4aa49 RL |
1978 | * |
1979 | * Returns: 0 for success | |
090eb6c4 | 1980 | * Locking: must be called with the RTNL mutex held |
85b4aa49 | 1981 | */ |
090eb6c4 | 1982 | static int fcoe_hostlist_add(const struct fc_lport *lport) |
85b4aa49 | 1983 | { |
014f5c3f CL |
1984 | struct fcoe_interface *fcoe; |
1985 | struct fcoe_port *port; | |
1986 | ||
1987 | fcoe = fcoe_hostlist_lookup_port(fcoe_netdev(lport)); | |
1988 | if (!fcoe) { | |
1989 | port = lport_priv(lport); | |
1990 | fcoe = port->fcoe; | |
1991 | list_add_tail(&fcoe->list, &fcoe_hostlist); | |
85b4aa49 RL |
1992 | } |
1993 | return 0; | |
1994 | } | |
85b4aa49 | 1995 | |
85b4aa49 | 1996 | /** |
34f42a07 | 1997 | * fcoe_init() - fcoe module loading initialization |
85b4aa49 | 1998 | * |
85b4aa49 | 1999 | * Returns 0 on success, negative on failure |
34f42a07 | 2000 | */ |
85b4aa49 RL |
2001 | static int __init fcoe_init(void) |
2002 | { | |
38eccabd | 2003 | unsigned int cpu; |
8976f424 | 2004 | int rc = 0; |
85b4aa49 RL |
2005 | struct fcoe_percpu_s *p; |
2006 | ||
dfc1d0fe CL |
2007 | mutex_lock(&fcoe_config_mutex); |
2008 | ||
38eccabd | 2009 | for_each_possible_cpu(cpu) { |
5e5e92df | 2010 | p = &per_cpu(fcoe_percpu, cpu); |
38eccabd RL |
2011 | skb_queue_head_init(&p->fcoe_rx_list); |
2012 | } | |
2013 | ||
8976f424 RL |
2014 | for_each_online_cpu(cpu) |
2015 | fcoe_percpu_thread_create(cpu); | |
85b4aa49 | 2016 | |
8976f424 RL |
2017 | /* Initialize per CPU interrupt thread */ |
2018 | rc = register_hotcpu_notifier(&fcoe_cpu_notifier); | |
2019 | if (rc) | |
2020 | goto out_free; | |
85b4aa49 | 2021 | |
8976f424 | 2022 | /* Setup link change notification */ |
85b4aa49 RL |
2023 | fcoe_dev_setup(); |
2024 | ||
5892c32f CL |
2025 | rc = fcoe_if_init(); |
2026 | if (rc) | |
2027 | goto out_free; | |
85b4aa49 | 2028 | |
dfc1d0fe | 2029 | mutex_unlock(&fcoe_config_mutex); |
85b4aa49 | 2030 | return 0; |
8976f424 RL |
2031 | |
2032 | out_free: | |
2033 | for_each_online_cpu(cpu) { | |
2034 | fcoe_percpu_thread_destroy(cpu); | |
2035 | } | |
dfc1d0fe | 2036 | mutex_unlock(&fcoe_config_mutex); |
8976f424 | 2037 | return rc; |
85b4aa49 RL |
2038 | } |
2039 | module_init(fcoe_init); | |
2040 | ||
2041 | /** | |
34f42a07 | 2042 | * fcoe_exit() - fcoe module unloading cleanup |
85b4aa49 RL |
2043 | * |
2044 | * Returns 0 on success, negative on failure | |
34f42a07 | 2045 | */ |
85b4aa49 RL |
2046 | static void __exit fcoe_exit(void) |
2047 | { | |
5e5e92df | 2048 | unsigned int cpu; |
014f5c3f | 2049 | struct fcoe_interface *fcoe, *tmp; |
2e70e241 | 2050 | struct fcoe_port *port; |
85b4aa49 | 2051 | |
dfc1d0fe CL |
2052 | mutex_lock(&fcoe_config_mutex); |
2053 | ||
85b4aa49 RL |
2054 | fcoe_dev_cleanup(); |
2055 | ||
5919a595 | 2056 | /* releases the associated fcoe hosts */ |
090eb6c4 CL |
2057 | rtnl_lock(); |
2058 | list_for_each_entry_safe(fcoe, tmp, &fcoe_hostlist, list) { | |
c863df33 | 2059 | list_del(&fcoe->list); |
2e70e241 | 2060 | port = lport_priv(fcoe->ctlr.lp); |
2e70e241 | 2061 | fcoe_interface_cleanup(fcoe); |
2e70e241 | 2062 | schedule_work(&port->destroy_work); |
c863df33 | 2063 | } |
090eb6c4 | 2064 | rtnl_unlock(); |
85b4aa49 | 2065 | |
8976f424 RL |
2066 | unregister_hotcpu_notifier(&fcoe_cpu_notifier); |
2067 | ||
014f5c3f | 2068 | for_each_online_cpu(cpu) |
8976f424 | 2069 | fcoe_percpu_thread_destroy(cpu); |
85b4aa49 | 2070 | |
dfc1d0fe | 2071 | mutex_unlock(&fcoe_config_mutex); |
2e70e241 CL |
2072 | |
2073 | /* flush any asyncronous interface destroys, | |
2074 | * this should happen after the netdev notifier is unregistered */ | |
2075 | flush_scheduled_work(); | |
2076 | ||
2077 | /* detach from scsi transport | |
2078 | * must happen after all destroys are done, therefor after the flush */ | |
2079 | fcoe_if_exit(); | |
85b4aa49 RL |
2080 | } |
2081 | module_exit(fcoe_exit); | |
11b56188 CL |
2082 | |
2083 | /** | |
2084 | * fcoe_flogi_resp() - FCoE specific FLOGI and FDISC response handler | |
2085 | * @seq: active sequence in the FLOGI or FDISC exchange | |
2086 | * @fp: response frame, or error encoded in a pointer (timeout) | |
2087 | * @arg: pointer the the fcoe_ctlr structure | |
2088 | * | |
2089 | * This handles MAC address managment for FCoE, then passes control on to | |
2090 | * the libfc FLOGI response handler. | |
2091 | */ | |
2092 | static void fcoe_flogi_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
2093 | { | |
2094 | struct fcoe_ctlr *fip = arg; | |
2095 | struct fc_exch *exch = fc_seq_exch(seq); | |
2096 | struct fc_lport *lport = exch->lp; | |
2097 | u8 *mac; | |
2098 | ||
2099 | if (IS_ERR(fp)) | |
2100 | goto done; | |
2101 | ||
2102 | mac = fr_cb(fp)->granted_mac; | |
2103 | if (is_zero_ether_addr(mac)) { | |
2104 | /* pre-FIP */ | |
2105 | mac = eth_hdr(&fp->skb)->h_source; | |
2106 | if (fcoe_ctlr_recv_flogi(fip, lport, fp, mac)) { | |
2107 | fc_frame_free(fp); | |
2108 | return; | |
2109 | } | |
2110 | } else { | |
2111 | /* FIP, libfcoe has already seen it */ | |
2112 | fip->update_mac(lport, fr_cb(fp)->granted_mac); | |
2113 | } | |
2114 | done: | |
2115 | fc_lport_flogi_resp(seq, fp, lport); | |
2116 | } | |
2117 | ||
2118 | /** | |
2119 | * fcoe_logo_resp() - FCoE specific LOGO response handler | |
2120 | * @seq: active sequence in the LOGO exchange | |
2121 | * @fp: response frame, or error encoded in a pointer (timeout) | |
2122 | * @arg: pointer the the fcoe_ctlr structure | |
2123 | * | |
2124 | * This handles MAC address managment for FCoE, then passes control on to | |
2125 | * the libfc LOGO response handler. | |
2126 | */ | |
2127 | static void fcoe_logo_resp(struct fc_seq *seq, struct fc_frame *fp, void *arg) | |
2128 | { | |
2129 | struct fcoe_ctlr *fip = arg; | |
2130 | struct fc_exch *exch = fc_seq_exch(seq); | |
2131 | struct fc_lport *lport = exch->lp; | |
2132 | static u8 zero_mac[ETH_ALEN] = { 0 }; | |
2133 | ||
2134 | if (!IS_ERR(fp)) | |
2135 | fip->update_mac(lport, zero_mac); | |
2136 | fc_lport_logo_resp(seq, fp, lport); | |
2137 | } | |
2138 | ||
2139 | /** | |
2140 | * fcoe_elsct_send - FCoE specific ELS handler | |
2141 | * | |
2142 | * This does special case handling of FIP encapsualted ELS exchanges for FCoE, | |
2143 | * using FCoE specific response handlers and passing the FIP controller as | |
2144 | * the argument (the lport is still available from the exchange). | |
2145 | * | |
2146 | * Most of the work here is just handed off to the libfc routine. | |
2147 | */ | |
2148 | static struct fc_seq *fcoe_elsct_send(struct fc_lport *lport, | |
2149 | u32 did, struct fc_frame *fp, unsigned int op, | |
2150 | void (*resp)(struct fc_seq *, struct fc_frame *, void *), | |
2151 | void *arg, u32 timeout) | |
2152 | { | |
2153 | struct fcoe_port *port = lport_priv(lport); | |
2154 | struct fcoe_interface *fcoe = port->fcoe; | |
2155 | struct fcoe_ctlr *fip = &fcoe->ctlr; | |
2156 | struct fc_frame_header *fh = fc_frame_header_get(fp); | |
2157 | ||
2158 | switch (op) { | |
2159 | case ELS_FLOGI: | |
2160 | case ELS_FDISC: | |
2161 | return fc_elsct_send(lport, did, fp, op, fcoe_flogi_resp, | |
2162 | fip, timeout); | |
2163 | case ELS_LOGO: | |
2164 | /* only hook onto fabric logouts, not port logouts */ | |
2165 | if (ntoh24(fh->fh_d_id) != FC_FID_FLOGI) | |
2166 | break; | |
2167 | return fc_elsct_send(lport, did, fp, op, fcoe_logo_resp, | |
2168 | fip, timeout); | |
2169 | } | |
2170 | return fc_elsct_send(lport, did, fp, op, resp, arg, timeout); | |
2171 | } | |
2172 |